3 Things to Consider when buying an Air Purifier - Particle Sizes: Ultrafine, Fine, and Coarse 

Thank you so much for your nice comment. I am trying my best, lol! Thanks!👍

I agree and its explained well too!!, I would actually pay for a consult

Thank you for the comment. I appreciate it!😄

Thank you for watching! 😃

I sold the Dyson Tower Fans in the past but never considered them to be even decent air purifiers. They are well made and cool looking and I believe they do a good job of fanning/cooling a room. However, they are not good at filtering the air from an "air purification" perspective and I have never recommended them to any of my clients as an air purification solution.

Hello and thank you for your nice words. Holy Cow - looks like the 468 is about $999. And it only lasted 2 years? That stinks! ☹ I checked all over their website but didn't see the actual warranty for the unit. That is pretty rare for an air purification company to not display their warranty up front, IMO. The Aeris 3 in 1 is expected to come back to the US (if you live here) some time in 2024. But they have made some changes to it and it will be called the Klaara P7. Quick video on it if you didn't see: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-V6zZlBNOJ_4.html For ultrafine particles and mold spores I'd go with the IQAir HealthPro Plus. It is a great unit and I run one in my family room. 10 year warranty which they doubled from a 5 year warranty around 2016. So, that is what I would currently recommend based on the units I have experience with. Good Luck! 👍

@@AirPurificationEducation thanks for the advice. I'm still trying to get the Inteliipure company to make it right and have a complaint drafted. Can I share it with you via email? Also, I bought and will return the 2 Dyson Big & Quiets but it only does particle sizes down to 0.1 microns. I looked at getting the Medify AIRx because they sell an H14 filter, but when you go to the website the filter is sold out. I owned the IQAir HealthPro Plus for 10 years and recently gave it away. The filters are very expense and it seems the technology hasn't changed much. Is the IQAir Atem X Air newer tech? Thanks in advance for your help!

Sure, you can share the email w/ me if you wish. I wonder what their warranty actually is. Maybe the warranty is somewhere on their website but I couldn't find it - which seems pretty uncommon to me. I tried to find it in their manual but they make you give them your email address to view the manual... which is very unusual and kinda strange to me. I don't like it. The Dyson Big and Quiets are interesting and I may grab one sometime to review it. I don't know how good Medify is either - may have to check them out, as well, but my knee-jerk reaction is neither the Dyson nor the Medify are elite for particulates. The IQAir HPP average annual filter replacement cost is about $140 per year but the Intellipure 468 appears to charge $159 just for the HEPA filter that is supposed to be replaced annually. And it seems they charge $285 for the "Annual Filter Set" according to their website... so, I think the HPP is less expensive for the average annual cost of the replacement filters. But that also depends on what speeds you run it on. 1) The Atem X covers more space and has all the modern "bells and whistles" with a sensor and a Smart app. However, it does not filter ultrafine particles as well as the HPP. Only 99% at .003 microns vs. the HPP 99.5%. Plus, it does not have any carbon for VOCs/odors like the HPP. The fact that IQAir was not able to replicate the filtering ability of the HPP for ultrafine particles (over 15 years later) is a tribute to how impressive the original HPP is, IMO. The HPP is elite and was way ahead of its time, IMO. Several companies have attempted to copy its airflow design. There are advantages from a sealing standpoint - to having the air flow from the bottom - up through the filters out the top, IMCO (Current). 2) Aeris copied their airflow design and somehow improved on it. And the founders from Aeris both went to the 7th top-rated school in the world (ETH Zurich) for Engineering. And one of them has a Master's Degree in Engineering from MIT (ranked #1). They have brilliant engineering minds. The fact that they copied the HPP's airflow design when they created the 3 in 1 in 2015 is another tribute to how impressive the original HPP is, IMO. 3) Basement Systems is a fairly large company with contractors throughout the US. They decided to create an air purification solution called the Aspen and they literally tried to copy the HPP. I think they get the filters made in China... Clearly, they are trying to copy the IQAir solution - as we can see in this link: www.basementsystems.com/air-purifier.html The Aspen has a little more airflow than the HPP but it also has 60% less carbon that the air is flowing through and I'm pretty positive it is not sealed nearly as well as the HPP as I don’t see the filters really get sealed in the unit. And I would bet anything it won't be able to hit 99.5% at .003 microns. + their solution is not EN1822 certified like the HPP, either. So, I'm pretty sure the HPP is far superior at ultrafine particles. 4) Camfil is the world's largest filter manufacturer with 31 manufacturing locations all over the globe and 5,200 employees. They are a 60-year-old manufacturer. A Billion dollar company. They also create high-level industrial filtration solutions for manufacturing, etc. They have supplied filters for NASA in the past. Plus, they are experts at testing filters, as well. About 3 years ago (I’m guessing), they came out with the CC500 which has the EXACT same airflow as the HPP. The air comes in from the bottom - up through the filters - and then the clean air exits out the top sides in all 4 directions - EXACTLY like the HPP. They basically copied the HPP’s airflow I’m thinking. www.camfil.com/en-us/products/air-cleaners--air-purifiers/city-range/city/camcleaner-cc500-_-56430 They test every filter that comes off the manufacturing line for the CC500 and they appear to have a much better seal inside the unit than most companies out there. The CC500 filters seem to test out at 99.99% at .3 microns… better than HEPA… but I don’t know the ultrafine numbers. I would not be surprised if they beat 99% of the competition for particulate and ultrafine filtration. These guys are filtration experts and their HEPA filters have metal housings which is rare to find in the stand-alone air purification industry. They are hardcore. I’ve seen metal housings on HEPA filters for the ISS - International Space Station and DOE - Department of Energy… Serious HEPA solutions. They probably have them for industrial and pharmaceutical applications, as well. Again, serious filtration environments. But it is hard not to notice how they copied the HPP’s airflow design for the CC500. 5) I also saw a high-level $5,000 air purifier recently which also 100% copies the HPP airflow, as well. “Imitation is the sincerest form of flattery” So, I’d say the HPP is still elite for particle filtration and blows away 99.8% of the air purification solutions on the market today. Their engineering team absolutely nailed it over 20 years ago with the HPP as many companies and some of the best companies in the industry are still trying to copy their design. Crazy. Of Note: I also found on a brochure that Camfil claims their CC500 was developed in 1963 but I find that hard to believe. The company was started in 1963 so I think it is possible their marketing team may have made a mistake with the wording on this. That said, if they actually did create the CC500 in 1963 then IQAir and everyone else probably copied them. I want to eventually find this out. Thanks!👍 @@33johnson19

Hey Dave, thank you for the comment. I didn’t want to be so long-winded on this however, one thing led to another and I ended up typing a LOOONG answer - as I think there are many points/issues to consider. Here are my current thoughts on this issue. Of note: As always, I am completely open to changing my opinions based on new info… 1) I currently agree with you that “very well made” HEPA filters can most often more easily filter particles at .01 microns than .3 microns (basically smaller and larger particles are easier to filter). But the important words to focus on in that sentence are “very well made”. 2) In my current opinion, the "Physics of Filtering" does not apply to every single "HEPA filter" on the market. "Independent Engineering Fundamental Tests regarding the mechanisms of filtration" ONLY applies to the SPECIFIC filter being tested in that particular test. We cannot take the results from one specific test on one specific HEPA filter and simply apply the results from that test to ALL the other HEPA filters on the market and assume they will all filter in the same manner and to the same degrees. Because all the other HEPA filters on the market are not of the same quality. For example, if we truly believe all HEPA filters are the same then we would have to agree that an inexpensive, Chinese-made $27 HEPA filter for a $45 air purifier will perform exactly the same as the extremely well-engineered, expensive, HEPA filters in the International Space Station. And this simply cannot be the case. 3) The results from the testing of the HEPA filters in the International Space Station are not the same results we will receive if we test a $27 HEPA filter for a cheap, residential air purifier. I think there are many reasons for this, including: A)The “HEPA Filters” themselves, are made of different HEPA materials (some are made of cheap materials and some are made of much more expensive materials). B) They utilize different amounts of HEPA material in the filters. C) They utilize different adhesives to attach the HEPA material to the housings. D) And they use different Housings - some use metal/steel. But most of the residential air purifiers use different types and different levels of quality of cardboard - which tends to make them pretty easy to bend (among other differences, as well). 4) Not all “HEPA Air Purifiers” filter at exactly the same rates. Please take a look at my video called: "HEPA Filters - Are they all the same?" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ur6J6jqIEmY.html 5) If we compare: A) An inexpensive, Chinese-made, $27 HEPA Filter from Smart Air that is an inch in thickness to… B) A 3rd party Chinese made cylindrical “HEPA” filter replacement from Filter Monster that costs 40% less than the original manufacturer’s American-made replacement “HEPA” filter (and also somehow weighs 22% less)… to C) A $200 HEPA filter for the Camfil City M air purifier (which claims their MPPS is .18 microns and their HEPA filters hit 99.998% at MPPS - and they are a billion dollar filter manufacturer with 55 years of filter manufacturing experience + they are experts at testing HEPA filters, as well, with state of the art, modern, testing equipment/facilities ) to… D) The HEPA filter(s) on the ISS - International Space Station to… E) The 1.25” thick HEPA filters used by the the Winix 5500 which are $89 (including 4 carbon prefilters) If we compare all 5 of these “HEPA Filters” to each other... *Are we to expect/assume that ALL these HEPA filters will filter EXACTLY the same for all the particles at the different sizes? *The $27 HEPA filter will filter .1 microns at exactly the same level and efficiency as the ISS HEPA filter? *I had an air purifier manufacturer tell me that none of the 3rd party Chinese replacement HEPA filters for their air purifier actually tested out at a HEPA level. But the 3rd party American made filter replacements performed comparably to their actual HEPA filter replacements. So, they definitely saw a difference in the performance of HEPA filters that were manufactured by different companies and from different countries. *How do we know the $27 HEPA filter is going to definitely filter the smaller particles better than the particles that are .3 microns in size… when it uses different HEPA material, different adhesives/glues, etc. than the HEPA filters used in some of the tests performed by some of the colleges/universities? Especially when there isn’t any 3rd party testing to prove it’s filtration performance… *Are we to expect that these 5 HEPA filters will all filter exactly 99.97% or better at .3 microns? The expensive filters made of better quality materials will perform exactly the same as the cheaply made ones? *And are we to believe the $27 HEPA filter for the $49 Smart Air Purifier and the $89 HEPA filter for the $150 Winix 5500 will both filter EXACTLY the same as the $1,099 Camfil City M $200 HEPA filters? They will all filter at the same levels and they will all definitely filter better at .01 microns than .3 microns? Even when the filters get dirty/clogged after 3 months of use… and even on their highest CFM speed settings? Do we think all the “HEPA” filters on the market will filter the same as the HEPA filters used in some of these official “HEPA” tests? In my current opinion - I highly doubt they will all filter the smaller particles at exactly the same levels. And I also think it is very possible that not all 5 of the HEPA filters/air purifiers will all filter the larger and smaller particles outside of .3 microns better than they will perform at .3 microns. All these filters will not perform exactly the same at the different micron levels. Because if they did… Then the ISS could simply have installed inexpensive Chinese made Smart Air HEPA filters… and/or it would not matter where the ISS got their HEPA filters manufactured from… and an inexpensive, Chinese made, HEPA filter would perform just as well as the expensive, well engineered, HEPA filters they currently utilize. And Camfil states they have, in fact, supplied some of the HEPA filters for the ISS. Steve Smith, who is supposed to be an “Industry Expert” according to Camfil - said in Sept. 2021, “MPPS, in the air filtration world, is the most penetrating particle size, which happens to be 0.1 to 0.3 microns. Smaller and larger particles are actually easier to capture. ” So, this statement in general, would somewhat agree with your original assessment, I think. However, in this video he says, “A bio-safety HEPA filter that can collect 99.995% of .3 micron sized particles is stopping all of the sizes at nearly 100%.” cleanair.camfil.us/2021/09/17/new-video-from-camfil-explains-mpps-in-air-filtration-technology-with-industry-expert-steve-smith/ And again, I think we need to focus on the specific terminology, “A bio-Safety HEPA filter” in that sentence and also we need to realize he is a representative for Camfil and they’ve been making HEPA filters/solutions for the pharmaceutical industry, medical industry - they have experience manufacturing solutions for clean rooms, and again, the ISS, etc. So, the quality of their HEPA filters is extremely high. The same cannot be said for all the HEPA filters in the residential air purifier market. So, the Camfil HEPA filters are probably of a much better quality than a $27 Chinese made HEPA filter in a cheap air purifier. Probably a night and day difference in quality and performance. And it is probably a much better quality HEPA filter than the vast majority of the HEPA filters found in most residential air purifiers… especially the cheaper units that are $150 and less in price. Steve Smith goes on to say in his video - in regards to how well the filters perform, “The only way to be certain is to ask for the Filter Scan Test Report. And any reliable Filter Company should provide that with each HEPA purchase.” I currently have 12 different air purifiers from 9 different manufacturers but only 2 of them provided me with the documentation showing the performance of the filters in the units before they shipped them to me. Those 2 companies were IQAir and Camfil. The IQAir HealthPro Plus and the Camfil City M are both EN1822 certified for their HEPA filters. IQAir was the 1st residential air purifier company to get this certification for the HealthPro Plus - several years ago. My Aeris 3 in 1 is also EN1822 certified. But none of the other 9 air purifiers I have possess this certification. And none of the other air purifiers provided me with a Filter Scan Test Report. The other air purifier HEPA filters are not all going to perform as well as the Camfil HEPA filters and they are not all going to perform as well as the IQAir HPP “Total System Efficiency” filtration levels, either. (Continued Below)

6) IQAir states their HyperHEPA filter is 99.97% efficient at .003 microns: www.iqair.com/us/products/replacement-filters/hyperhepa-h12-h13-f3 The IQAir HealthPro Plus I received came with documentation that states the air purifier, itself, was tested and it filtered 99.99% at .3 microns and larger. The HPP MPPS is .22 microns and the unit is supposed to hit 99.95% at that level. However, the IQAir website states that the HealthPro Plus was 3rd party tested and it only hits 99.5% at .003 microns which is contrary to the “it is easier to filter all particles larger and smaller than the MPPS”. www.iqair.com/us/air-purifiers/healthpro-series Also, the Camfil City M I received provided documentation that my HEPA filters tested at 99.998% at .18 microns. However, they also state that their City M only performs at 99.95% at .3 microns (the unit itself, does not filter at the 99.97% HEPA standardization level of a “True HEPA” filter). Again, another example of an air purifier, that does not filter other particles better than the MPPS filtration level of the HEPA filters inside the unit. In this case, it doesn’t filter some larger particles as well as the MPPS. So, those are two examples of air purifiers that do not necessarily filter smaller and larger particles better than the MPPS of the HEPA filters inside the units. IQAir calls the filtration performance of their HPP the “Total System Efficiency”. It is a little confusing when the companies interchange the HEPA filter performance in comparison to the “Total System Efficiency” of the air purifiers themselves that house the HEPA filters. In particular, I don’t want people to think that their air purifiers actually filter at the same levels that their HEPA filters were tested at… But rather, I want people to consider/be aware of the “Total System Efficiency” filtration level of the entire air purifier as that is really the only thing that matters for them in their environment. In most all cases the HEPA filters will tend to test better for particle filtration than the units/air purifiers with the filters in them. 7) I have found in my research that different sources provide different information on what they believe is the actual MPPS. Some sources state .3 microns to be the MPPS for HEPA filters but many other sources state that the MPPS for filters to be in the range from .1 to .2 microns in size. And as we see with Camfil - they are currently stating the MPPS to be .1 to .3 microns. So, there is definitely discrepancies in the air purification industry as to what the true MPPS is for HEPA filters… or even what the true range is. 8) I also currently believe at least 99% of the “HEPA Air Purifiers” on the market do NOT actually filter at a HEPA level in the real world for customers. It doesn’t matter how good the quality of the HEPA filter is inside an air purifier if there is not a very strong seal between the HEPA filter and the inside of the Air Purifier. Most air purifiers have very poor seals inside the units which enables dirty air to escape around the HEPA filters. And the dirtier the filters get over time - the more dirty air that will escape around the HEPA filters. If we look at 29:47 in the video “Coway Airmega Review 300 400S - Everything you need to know about this Air Purifier”... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-K5takUbLT9g.html We see that dust is clearly getting around the HEPA filters in the unit and it is therefore definitely not filtering at a HEPA level. And if it is not filtering at a HEPA level then it must also be poor at filtering the smaller Ultrafine particles, as well. If some of the larger particles are getting around the HEPA filter - then some of the smaller ones are also getting around the HEPA filter, as well. Also, if we look at 25:29 in the video: "HEPA Filters - Are they all the same?" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ur6J6jqIEmY.html We can see that a lot of dust is getting around the HEPA filter in the Winix 5500, as well, as there is a poor seal between the HEPA filter and the inside of the air purifier. So, just like the Coway 400S - it is therefore definitely not filtering at a HEPA level, either. And if it is not filtering at a HEPA level and 10 micron sized particles/and larger are getting around the HEPA filter (humans can only see particles 10 microns in size and larger - depending on the source we check) - then it must also be poor at filtering the smaller Ultrafine particles, as well. The same issue goes for the BlueAir 211i that I own - I just haven’t made a review video on it yet. But my Blueair appears to leak dirty air the most of any of the 12 air purifiers I currently own. It has a terrible seal between the filter and the unit. They claim in their marketing that their units perform BETTER than HEPA filters… but that is absolutely not the case in the real world. You can see dust leaking around the filters in many different areas with this unit. So it is also not doing a good job on the UF particles, either. So, those are just 3 real-world examples of HEPA Air Purifiers not actually working at a HEPA level and leaking a lot of dirty air around the filters. 9) Also, Levoit got busted a few months ago for marketing their Core 300 air purifiers as having True HEPA filters inside the units. It appears they do not have actual HEPA filters in the Core 300 units. So they had to take the word “HEPA” off their online advertisements/marketing content for this particular unit (+ 2 other Levoit units, as well, it appears). This is just one example of a company getting caught pretending their unit works at a HEPA level when it doesn’t even possess a HEPA filter. They can’t be the only company doing this. If every air purifier on the market was checked very carefully - I am sure we would find many other “HEPA” units don’t actually even have True HEPA filters inside of them. So, I currently do not believe all the HEPA filters in all the mass produced residential air purifiers actually filter at a HEPA level. I also do not believe all HEPA filters do a good job of filtering Ultrafine particles (.1 to .003 microns). And I am very confident that most HEPA air purifiers do not perform at a HEPA level either… as most air purifiers leak dirty air around their HEPA filters due to poor seals within the units. 10) I currently do believe it is easier for very good quality HEPA filters to filter particles larger and smaller than their MPPS. But again, the important verbiage in that sentence I would stress is “very good quality HEPA filters.” Most HEPA filters contained in the vast majority of residential air purifiers are not of “very good quality” and their poor seals within the units themselves, enable some particles to leak around the HEPA filters. I believe this is currently the norm in the industry. So, the air purifiers themselves, in most (and possibly all) cases, do not actually filter, as well as, the HEPA filters inside of them (when the HEPA filters are tested independent of the air purifiers). As always, I am open to new information on this topic - just like all other air quality topics but… These are some of the issues I currently believe about this topic. Thank you (if you made it this far… I know it was probably a snooze fest, LOL!). 👍

Very Interesting. I am currently making a video on HEPA filters and a lot of different sources say a lot of different things and it is a bit confusing, lol! Can you please give me the link on that IQAir testing data? 1) I currently believe over 90% of the so called HEPA air purifiers on the market do not actually work at a HEPA Level - especially, after their filters get some debris on them after some use. Different HEPA filters made by different manufacturers and made of different materials with different housings around the filter media? Hmmmmm.... they ALL filter exactly the same? I highly doubt it. 2) Oransi (an American air purifier manufacturer) claims: "More recent research has revealed the most penetrating particle size (MPPS) to be in the range of 0.04 to 0.17 microns. " So, IDK. Some sources say a good HEPA filter will filter most of the UltraFine particles but I currently don't totally 100% believe this. I think there may possibly be more variables involved. 3) I'm not married to IQAir but I will say I've spoken with many customers through the years, who switched from other "HEPA" air purifiers to the HealthPro Plus and they told me that they experienced better breathing results - and oftentimes, a lot better breathing results. This has obviously had an impact on my thinking and belief system. I do think the HPP is an elite air purifier for particulates and much better than the vast majority of units on the market. I've dealt with way too many customers who have had glowing reviews of it's performance for it not to be a special unit. 4) Another huge issue is the seals within the units - the seals between the filter media and the unit. I think the HPP and the Aeris 3 in 1 may have somewhat of an advantage in their designs over other air purifier designs from a leakage standpoint. I'm going to make a video on this after this HEPA video. Thank you for your input! 👍😄

I agree about the seals in the filters and how the filters are sealed in the purifier. Maybe it should be standard practice to test the whole unit not just the filter. But I'm confident in the EN1822 standard. I've sent links to your website. 😊 Theres a lot of anecdotal evidence out there, If you pay $900 dollars for a purifier then you are needing to justify to your self spending that amount of money.😄 Anyway I have sent the links for the IQ Air test results. Personally I do not believe it filters particles better than purifiers costing $700 dollars less, but it does do much better for VOCs.😄 there's lots of people who say they have had relief from their allergies using a Winix or Coway purifier amongst others, so we need more scientific evidence. I think a standard test procedure like the EN 1822 would be a good start. It's more stringent than the current US standard.

1) Yes, 100% entire air purifier needs to be tested, for sure. I currently think the majority of air purifiers on the market have not been tested by reputable 3rd parties and many of the marketing claims they make really irritate me as I find them to be very deceptive. Many air purifier manufacturers are taking great liberties with their marketing campaigns. 2) Yes, most air purifiers will 'improve' the overall air quality in a space and a Winix or Coway can help with asthma and allergies for sure. But a HPP will typically (depending on what is going on in the space) improve the air quality better than most all other units from a particulate standpoint. I would be VERY SURPRISED if the HPP is not superior for filtering particles than 99% of all the air purifiers currently on the market. It is elite for particle filtration. They've been at this for over 50 years, now - the current owner is 2nd generation. I met with him in Vegas for 3 days - some years ago and that dude is "ALL BUSINESS ALL DAY LONG" 100% obsessive, compulsive about air quality. I don't think he talks or thinks about anything else. I wouldn't wanna be married to him, lol! 😆 3) In the 15 years in my last company where we sold about 50 different air purifier brands... US Hospitals ONLY ordered IQAir equipment. I NEVER had 1 order from a US hospital in 15 years for any other air purifier brand than IQAir. And I'm talking about at least 50 different US hospitals all around the US going with IQAir equipment... Every Single Time. Probably because it was EN 1822 certified. Also, when the air quality was super bad in China about 8 years ago - the ONLY air purifier the Chinese Brokers wanted to order was the HPP. And I mean they would sometimes try to order 500 IQAir HealthPro Plus units at a time. We'd get orders for over $100K ONLY for the IQAir HPP. And this went on for many months. They didn't want any of the other 50 brands that we carried - ONLY the HPP. So, the Chinese knew the HPP was elite and the US hospitals also exclusively went with it. For this and many other experiences I've had with the unit - I do not currently agree with you that other $700 and less air purifiers filter particles as well. But we can agree to disagree on this - I am not married to these guys and I am totally openminded - things change and new solutions hit the market every month so... eventually, I'd think we should be seeing some new amazing options - maybe with new technologies... I waited a LONG time for a brand to equal or surpass IQAir - and I think the Aeris 3 in 1 achieved this. But I def. don't know all the solutions on the market worldwide - for sure. 4) I totally agree with you that all air purifiers should be put to the EN 1822 testing/certification process. But, I think it would separate the men from the boys and there are many air purifier companies currently getting RICH with their sketchy marketing. If the EN 1822 results became available for all air purifiers - it would be devastating for much of the industry. In the US we have the CADR ratings which are GARBAGE! and I did a video on this if you saw it. Many air purification companies rig their units to do well in the CADR test and then market the results like they actually mean something. Very sad for the unsuspecting US consumers. 5) I got your email - with the links! Thank you! 👍😄 and thanks for adding a new quality air purifier to my radar - I don't know if I've heard of the MedicAir b4 - sometimes all the different names start to sound the same. Thanks - very interesting! @@2711marcus

@@AirPurificationEducation Glad you received the links 😊 Will be very interesting to see new products and technologies coming to the market in hopefully the near future 🤞

Hey Marcus, you had emailed, "Personally I think the quality of air required in Labs etc should be the same in our homes and offices,or at least very close to, wouldn't that be a great thing :)" And I do think over time we are actually headed in this direction. A lot of money and research has been spent the past few decades on "outdoor air quality" and the findings are useful for sure... but Americans stay indoors an average of 93% of the time. So, I think one of the next big movements will be in regards to indoor air quality for businesses, schools, etc. I think there is going to eventually be legislation which will force schools (first) and then maybe even businesses to provide a certain level of air quality for the students/employees. I saw some crazy data recently concerning test scores for kids in school and how they fluctuate wildly depending on how much CO2 is in the air and even airline pilots failing flying tests when they were exposed to too much CO2. Better air quality will enable kids to do better in school and enable employees to be more productive. The results of these types of tests are becoming available more and more. I really believe we are at the doorstep of the entire "air quality" industry increasing dramatically in different niches. We are really in the early stages (tip of the iceberg) of understanding how air pollution affects our health long term but our knowledge will improve dramatically in the coming years with better testing techniques/technologies, IMO. Harvard now has a "Healthy Buildings Program" and the Director recently consulted on the air quality for a new $2 billion skyscraper being built. I think we will be seeing more of this type of thing. Some folks say the air quality industry will become like the new "Clean Water" movement. We'll see. Thanks for your comments! 😃 @@2711marcus

Thank You! 😃

Thank you!👍

That's what she said🙃

I think the best solution for UFP out of that group of air purifiers - is going to be the IQAir Atem Desk unit blowing right in your face region - hands down - no question about it. 99% of the Air purifiers don't actually filter at a HEPA level and they tend to filter worse after a few weeks of real world use and dust and debris get in the filters... + they tend to filter worse on higher CFM. It is hard to filter UFP so I have a list of the best units for this but they ain't cheap: airpurificationeducation.com/best-air-purifiers-for-ultrafine-particles/ So, if I were to discount the IQAir Atem from that list you have - and we look at less expensive options - I actually think the Leitz TruSens Z-3000 may be the best option at a low price. Here is the unit on Amazon: amzn.to/4edxkgm And I did a write up on it not too long ago on it with reasons why I think it is probably better than the 5500 and the Coway Mighty: I have never sold or owned any Leitz air purifiers so I am providing my opinion based on what I can figure from analyzing information online. That said: 1) I am a BIG fan of German engineering, in general. 2) So, we take a look at their website and they make many different products: Paper shredders, Laminating, Binding and Cutting Products, filing products, Smartphone and Computer Accessories and other solutions, as well… and they also make air purifiers. When a company makes many different products and - oh by the way - they now also make air purifiers - they are typically not elite performing air purifiers. Like Coway. Coway makes a lot of different products and they make some good air purifiers for the money but not elite filtering ones. The companies that make elite filtering solutions typically ONLY make air purifiers like IQAir, Airpura, Camfil, etc. 3) I was told by a commentor in the past that Leitz was EN1822 certified by a German 3rd party testing company - the same one that tested IQAir. That said, IQAir has been tested by at least 2 different 3rd party companies. And the IQAir HealthPro Plus was tested for the “entire system” - meaning with the filters in the unit. THAT is impressive. Most companies that show “testing results” will only have the filters tested and they won’t have the actual air purifiers tested with the filters in them. In almost every case the “entire system” testing results will be WORSE than just the filter being tested by itself. Partially because you need a GREAT seal between the HEPA filter and the inside of the air purifier. This is oftentimes NOT easy to accomplish. On the Z-2000 and Z-3000 (in US) and Z-2500 and Z-3500 (in Europe) specifically - my initial opinions are: 4) Gaskets/Seal: The Gaskets at the bottom of the filter and the top are OK looking from a quality standpoint. That said, I LOVE the fact that you screw the filter into the unit. Assuming the screwing motion enables you to really press the filter up against the top of the inside of the unit and the bottom portion. If if forces you to screw the filter until it won’t budge anymore… this would create a much better seal than the vast majority of less expensive cylindrical filter type air purifiers. And a much better seal than the vast majority of air purifiers with perpendicular installed filters. For an inexpensive solution - their internal seal appears to be much better than the vast majority of less expensive airpurifiers on the market, for sure. 5) Carbon: The tiny amount of carbon they supply with the unit is very poor and it will not help much with odors, at all. It was seemingly an afterthought. They do offer other filter options with more carbon but they make the mistake of putting the carbon last/after the HEPA filter in the Pet Filter option. Therefore, some carbon will eventually probably get into the air. So, I am not a fan of that option. But the other options where you can put the carbon filter before the HEPA seem like a good idea. 6) Prefilter: The prefilter is decent for the filters. And it is a better prefilter than most of the less expensive cylindrical filter air purifiers on the market. Therefore, the HEPA filter will not get clogged nearly as quickly as most of their competitor’s solutions. 7) Smart Features: I don’t care about the smart features as the air quality sensors on air purifiers tend not to be super accurate so I never recommend anyone purchase an air purifier based on the Smart features. Also, the apps. oftentimes tend to have issues. 8) EN1822 Certification: The filters themselves are EN1822 certified but not the “entire system”. Still, they appear to be decent quality filters for the money and there seems to exist a good seal inside the unit so I think the units will filter well for particles and definitely better than most less expensive cylindrical (and perpendicular) HEPA solutions on the market. 9) UV Light: I am not a huge fan of the UV Lights on air purifiers and I do not know how much they really improve the overall performance of the solutions. Most of the best filtering air purifiers on the market do not possess UV Lights so I currently don’t think it is a big value add. 10) Conclusion: I have to say I am impressed with these solutions from a particle filtration standpoint… and I gotta say - It looks like German engineering “did it again” to a certain degree… that said, I think the products may actually be manufactured in India. So, for a 300 sq. ft. room with 8 foot ceilings - you can get 5 air exchanges with the Z-3000/Z-3500 - which is really GOOD! I’d currently put this particular unit at #12 on my list of best air purifiers for particles for 300 sq. ft. - ahead of the Rabbit Air BioGS, the Coway Mighty and the Winix 5500. airpurificationeducation.com/asthma-allergies-and-dust-particulates-in-general/ I’m tempted to put it above the Coway 400 at #10 but the 400 would be able to get double the air exchanges in an hour and that may make it actually filter the room better even though it doesn’t possess a strong seal inside the unit. But, all in all - these Leitz cylindrical filter units look very good for the pricing. I’m gonna add them to my listing in the future. Thanks!👍

@@AirPurificationEducation Thank your for your VERY detailed response. If I purchase the Leitz through that link, will you benefit from that? Or can I buy through you, so that you get value exchange for helping me. To buy the Leitz locally where I am (South Africa, Cape Town). They charge 2.5x the rate of the amazon unit anyways, even with shipment and tax included. But I see we have a IQAir dealer here in South Africa which is selling the ATEM for $502 Look like replacement filters should be easily accessible for both units by the looks of it. Which is important I guess.

@@user-yn3ec3dy7o “Thank your for your VERY detailed response. If I purchase the Leitz through that link, will you benefit from that?” **Yes, but it is not a big deal, at all - it’s just $32 less expensive off of Amazon for Americans vs. off the manufacturer’s website - IDK you were outside the US. But thanks for thinking of me on this. “Or can I buy through you, so that you get value exchange for helping me.” **Yeah, thanks again but I don’t sell the units directly and it’s not a big deal - “consulting” with people in the comments section helps me “stay sharp” on the different solutions that are in the market - and it helps me make more accurate/better content for the channel so it all works out for me in the end - one way or another… But thank you for thinking about me on that. Wow! 2.5 x $198 = $495… that is crazy and just about the same price as the Atem Desk. So, the Atem Desk will be superior for particle filtration vs. most all air purifiers when you have it on your desk and it is shooting air directly in your face - I call this, “being in the direct line of fire” of the purified air and this is superior to the “semi air exchanges” that most all other air purifiers will provide in a space. Also, the Atem can get semi air exchanges in 150 sq. ft. with 8 ft. ceilings - it can get 2 of them an hour on high speed. Which isn’t great as it would be preferred to get about 4 per hour if possible. Yes, getting access to the filters IS a big deal, for sure. So, the next questions I would have are: 1) What do the 5500 and the Coway Mighty cost in your area? 2) How large is the room you are in? Square footage and ceiling Height? 3) How long are you going to be sitting at your desk per day? Thanks!👍

@@AirPurificationEducation Thanks man. Well I appreciate it :) 1) I just realized buying both of those units will be possible but to get replacement filters for those models might be a real pain, which I am not keen for So the Leitz you mentioned I can get here for $360. And filter replacements are easily available And the ATEM I can get here for $500 and filter replacements are also available. I dont think I will even entertain the 5500 and Coway Mighty anymore given the headaches I see forsee 2) My room is 4 x 4 x 2.35 in dimensions 3) I am in my room pretty much ALL DAY. I work, ALOT I think the Leitz filters down to 0.3 microns right?

@@user-yn3ec3dy7o I think it is probably better to go with the Leitz as it will probably be better over the course of an entire day for you. Plus, the replacement filters will be less expensive (cost of ownership) over time for you, as well. Most all the HEPA solutions say they can hit 99.97% at .3 microns but less than 1% can actually do this in the real world. It is much harder to filter at a HEPA level than most folks realize. The Leitz filters are EN1822 rated which is fantastic (esp. for such an inexpensive unit) but that does not mean the entire unit will hit HEPA levels of filtration with the filters installed. That is a whole different issue but, I LOVE the fact that Leitz "presses" the filter against the inside of the unit... This tells me they totally understand the whole "seal" issue and their seal is much better than competitors in this price range. I currently think the Leitz will filter particles the best of any solution I've seen for the money. The Atem will filter better for particles but I am not keen on less than 2 air exchanges in your room when it is not blowing directly on your face region. The Leitz will be much better for airflow issues in your space. So, please let me know what you think about the unit if you remember - Thanks!👍

This question was answered in the comment section of a different video (the CADR video) and the options I recommended were basically an IQAir HealthPro Plus, IQAir GC or an Aeris 3 in 1 unit. The room was about 1,000 sq. ft. and the best solution depends on a few variables including how often the fireplace will be used. Also, how important odor control was to the homeowner.

@@AirPurificationEducation yes it was answered on the other video’s comment section. Thank you for your great help!

Thanks - I just want future viewers to know I tried to help answer the question instead of just leaving it blank and ignoring it, lol - Thank You!😄@@hardboard82

Hey Tommy - Levoit has been VERY Deceitful with their customers and do NOT have actual HEPA filters in fully HALF of the air purifiers they sell. Dyson ratted them out to the BBB - Better Business Bureau last August and said 3 of their units don't have HEPA filters in them - like they claim... Well now, 11 out of 22 of the air purifiers on their website don't have the word "HEPA" associated with them and the Core 600S is one of those units: levoit.com/products/core-600s-smart-true-hepa-air-purifier?_pos=2&_sid=bd2e8b787&_ss=r "HEPA" is the MOST important word an air purification manufacturer can use in their marketing and advertising to sell their products and Levoit was forced by the BBB to take the word down from the advertising of some of their air purifiers. I just uploaded a video on the Amazon BEST Selling Levoit Core 300 which talks a lot about the situation: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-iL6mQcEKyCY.html And I made a list/ranking of some of the best air purifiers for Allergies. Click Here for Free Access to the "APE Guide to Air Quality Solutions": tinyurl.com/343a9s54 All that being said, if you have allergies to a pet - you may need to keep the pet out of certain rooms - even with a great air purifiers - to lower your reactions. Their dander gets everywhere and if you sit on a chair or couch in a room the pet has access to... then you are probably rolling in it at that point. I know of a guy who was SUPER allergic to his daughter's cat... couldn't stay in her home for 5 minutes without gagging.... so they got an Austin Air Healthmate and put it in the family room and the cat was NOT allowed in that space... and for the 1st time - the dad was able to enter his daughter's home and actually "visit" with her without having to leave in 5 minutes. Good Luck!👍

@@AirPurificationEducation thank you for the information. should i replace my 600s? sadly im on a budget

Hey Tommy, I recently created the first version of a "Guide to Air Quality Solutions" where I rank many of the different air purifier solutions in order of filtration capabilities. I will be adding many different environments/applications and solutions to this guide over time. Please Click Here: tinyurl.com/343a9s54 Please let me know if you have any questions. Thank you! @@tommypham1101

1) “I like your content. Very informative. Is the 90% of particulates are ultrafine, is this on number of particles or is it by mass?” Thank you and this is a very good question I have oftentimes wondered myself. So, here is my opinion without a 3rd party scientific study to back it up. I just cleaned the 4 small screens on my Aeris 3 in 1 air purifier last week. The screens help prevent the prefilter from getting clogged… and the prefilter helps prevent the Carbon filter and HEPA filter from getting clogged. We are supposed to clean the screens every month on this unit, but I decided to let it go for 4 months just to see what would happen. The little screens got so clogged with dust/debris that the airflow of the entire unit was reduced by 80% according to the anemometer I used before and after. Now, I ask myself… how many ultrafine particles would it take to equal the mass of the larger particles that clogged the little screens? Oh Boy! It would have to be an INSANE amount of UF particles as they are only .1 to .003 microns in size and we can’t even see them. And all the debris I cleared from the screens have to be larger than 10 microns as humans are only supposed to be able to see particles that are 10 microns and larger. So, based on this… I believe that the answer is definitely the number of particles - 90% of the number of particles in the air are ultrafine - but not the overall mass. I now remember some air quality company in the past say that for every particle of dust we can see with our eyes… there are 9 more that are smaller that we cannot see. Also, I think, it would take soooooo many UF particles to equal the mass of 1 piece of dust we can actually see. So, I currently believe it has to be the number… Also, UF particles can float in the air for hours while the heavier particles will tend to drop to the ground/surfaces much faster - so when we are breathing - I think we will tend to breathe many more UF particles… than larger particles… but the mass of the larger particles that we breathe will probably be greater in most cases. This is what I currently think. 2) “Are there secondhand purifying of ultrafine particles, in the sense that ultrafine particles might either coagulate or larger particles might shed ultrafine particles?” Man, this is another really good question/general topic… and something I have though about, as well. For example… many sources say the UF particles are the most dangerous to our health but there must be many different types of UF particles out there and some must be more damaging to us than others, right? That only makes sense… So, is it more dangerous for me to be breathing a million particles of dust from the sheets on my bed (that are .1 microns in size) or it is more dangerous for me to be breathing a million .1 micron sized particles from a construction site tearing down a building? We would be inclined to think our sheets would contain less dangerous UF particles, in general, however, what if a lot of them have mold or mycotoxins integrated with them? I mean… in general, I would think my sheets would contain less dangerous UF particles than a construction site but it will probably depend on a case by case basis + it may also depend on my genetic issues, as well, as to how much a particular toxin affect my overall health. And don’t even get me started on the issue of whether the sheets were washed with the massively toxic fabric softeners on the market… so many variables to consider… I saw a TV show a year ago about the babies who died in the Cleveland area several years ago… and the investigators found out it was from toxic mold coming into the babies rooms through the vents (from water damaged basements). But what was really crazy is that if 2 babies were sleeping in the same room - the baby right next to the air vent is the one who got much sicker or died - whereas the other baby who was in the exact same room and even the exact same crib… and only a few feet further from the vent - would not get nearly as sick… I thought that was crazy… Also, I had read years ago that dust is like a sponge and it will carry many different particles - that attach to it - like mold, etc. right into our bodies… so there will be many different levels of toxins that accompany dust into our systems… not all dust particles are the same when it comes to being dangerous to our bodies… So, it is hard to say… exactly how “bad” dust is for us… or UF particles… what is attached to those particles? And or what are the UF particles composed of? I think we are looking at years of future research to figure this stuff out and make it more black and white from a cause and effect standpoint. I don’t know if I answered your question and I kinda rambled on, LOL - as I tend to do… but yeah, there is A LOT of analysis that needs to performed on some of these issues, for sure - thanks! 👍

Thank you for your comment. I am not really familiar with the equipment/VOCs/items in your environment but with a little Googling... 1) "Lacquer has over 600 VOC (Volatile Organic Compounds) they are the gases emitted from the product. Even though lacquer has such a HIGH VOC level painters still choose to use it because it dries quickly and is a good resistance to household chemicals." 2) "Oil-based enamels are extremely high in VOC's - up to 350gms/L - which is why they are so smelly and are a major source of environmental air pollution. Using modern water-based enamels makes a huge difference to the health of the painter, the occupants of a house, and to our environment." 3) I had a guy a few weeks ago comment about how a lot of folks use 3D printers and apparently there are a lot of harmful pollutants that come out of them and many folks in that industry think cheap air purifiers help them. But he was skeptical that the inexpensive air purifiers were enough for protection. And I agreed with his assessment. And the EPA says, "Studies have found that the 3D printing process releases gases and particulates which could pose health risks to users." and "Fumes from 3D printers can also contain heavy metals like lead, mercury, and chromium which could be dangerous if inhaled over an extended period of time." 4) So, based on my limited knowledge of all these variables - my knee jerk reaction(s) would be: A) it is awesome that you have a good extractor - and that may possibly be the #1 best option for you. Quickly getting the polluted air out of that environment is probably the top priority for your health. B) The Winix 5500 will only help with some of the larger Coarse Particles and possibly some Fine particles (.1 to 100+ microns) but I personally would not trust it to protect me in your environment. This is a low end residential solution - more like a general bedroom solution... but you are in more of an industrial environment, IMO. C) I did some painting several years ago - with some super toxic paint for metal and I used a 3M Respirator at the time and it was super helpful. So, you may want to use some type of Respirator to help protect you. I remember it was kinda uncomfortable to wear but the paint I was spraying seemed to be crazy toxic so I couldn't imagine not using it... D) With all the potentially hazardous stuff in your environment - I'd really talk with AirPura.com and ask them what they think is best for you... as they are somewhat experts on the carbon/VOC side and they would probably have the best idea as to what you would require from a carbon solution. And I think you are also dealing with smaller particulates so they do have "Super HEPA" options, as well. E) You could also talk with Legend Brands (www.legendbrandsrestoration.com/ ) - they make the Dri-Eaz air scrubber solutions. Which are the most respected in the water restoration industry. When Covid broke out - hundreds of hospitals around the US purchased the Dri-Eaz air scrubbers and vented them outside hospital rooms. Their air scrubbers are also heavily used for mold remediation cleanups, as well. They could talk with you about helping you get the polluted air outside your space faster + by utilizing a real HEPA air scrubber (you can also add carbon to it) in the process, as well. They may definitely be able to help provide some good advice for you. F) If I was not going to do any additional research at all... and I could choose 1 solution to add to my environment... I'd probably just get an IQAir GC unit - as it has 12 pounds of really good carbon for many different types of VOCs... and it can also filter ultrafine particles at 95% down to .003 microns... now, that would be a good addition to the environment. G) It is hard for me to know how fast you are getting the pollutants out of your space... and some of these options probably cost more money than some would initially think to spend... but I'd say every dollar you spend to improve that environment is an "Investment" in your long term health. And "Health IS Wealth". Good Luck! 👍

@@AirPurificationEducation Thanks for the thoughtful response to my question. I've taken your advice and contacted AirPura for any guidance they may have. Thank you/Dave

1) A gentleman named Marcus, from Europe ( I think), posts in the comments section, and he recently alerted me to the Camfil City M and he just purchased 2 of them. It looks really good and I know Camfil is a GIANT in the industry - not just from a manufacturing standpoint but also from a testing standpoint, as well - so I expect their equipment to be very well made. That said, I don't know enough about it to comment. I would like to get my hands on one at some point in the future to "check it out" vs. the IQAir and Aeris solutions. 2) I have sold the EJ in the past and have received feedback on it, as well, and I do think it is a reputable unit: Housing - USA Filters - USA & Mexico Circuit Board - USA Motor/Fan - Germany That all sounds like a pretty nice package to me - that said, I'd have to see reputable 3rd party testing results to have an idea of where it ranks in the pecking order. Thanks!😃

Thank you for your question. I currently stay away from ionizers. I see some companies say that their particular ionizer was tested as being "safe" but I still don't currently trust them. Some of the best air purifiers in the market filtering for particles from companies such as IQAir, Aeris and even Camfil do NOT use ionizers. And I think IQAir and Camfil have created anti-ionizer content - so they are definitely against them. And Camfil is a billion dollar 55 year old filter manufacturer - maybe the largest in the world. So... I tend to believe them and IQAir on the ionizer issue. I plan on making a video on this subject in the future - thanks! 👍

Thank you so much!

1) Aeris 3 in 1 is not really available in the US from what I understand and the future of the product line is uncertain for the US and Europe so it is a risky purchase. That said, I just got an email from a woman who said she is able to get a 3 in 1 from Global Industrial at 20% off and she said they have the 3 in 1 and the Lite unit. www.globalindustrial.com/ 2) Camfil City M looks like a really good solution but I don't have any experience with it... I will probably get one in the future to check it out... Today's $699 sale price looks AMAZING!! But, the replacement filters look like they are $399!!!! Yikes! - shop.camfil.us/products/city-m-air-purifier 3) Now, the IQAir HealthPro Plus is also a great solution and I run one in my family room... Plus, it has 17% more CFMs than the Camfil solution for more air exchanges/larger spaces... so I think it is less risky to get the HPP than an Aeris unit but I don't really know how it stacks up against the Camfil completely. Edit Update: 4) OK for $740.94 with tax - I'M BUYING a CAMFIL RIGHT NOW!!! You sold me, LOL! Thanks for MAXING OUT MY CREDIT CARDS right B4 X-Mas, LOL! I bought 6 air purifiers 2 weeks ago to use and review and now, I'm getting this, as well. I know I wanna eventually review this product so I SIMPLY CAN'T pass up the price! 🤣 LET'S GOOOO!!!!

@@AirPurificationEducation HPP is my main unit with Rabbitair A2 in the bedrooms but I need more supplement. Ive been researching the Camfil City M for weeks now and I just feel like it’s “ The One “.. first listing I saw was for $1695 on Kirby Allison then I ran into Camfil page that being sold for $1295 and now $699! Im sorry for maxing out your credit card my friend but $740 w/tax is a steal! lol Im pulling the trigger right now as well. Camfil City M it is.. Btw, which six purifiers did you purchase recently? And I thought I was a purifier junky haha.

Yes, I saw the Camfil for $1,200 the past few weeks and thought to myself, "they are going to be really challenged to sell it in the B2C market in the US at that price." But, $699 is pretty attractive if they filter somewhat near a HealthPro Plus, IMO. I just don't know what their long term pricing will be after this sale. Yes, Rabbit is one I eventually have to get a hold of, as well. I am super happy you brought the Camfil sales price to my attention as I agree - it is an AMAZING deal... Besides, what more could the wife and son possibly want for X-mas? Then even MORE clean air, LOL!😆 Thankfully, I purchased less expensive units 2 weeks ago - as some folks want to know how they compare to some of the more expensive/better air purifiers so I got a cheap Ionizer called Clarifion that I've seen ads for on YT recently - but I think it is probably unhealthy for people... also got a Levoit, Blueair, Winix 5500, Coway Mighty, and an Aroeve (it seems to be popular on Amazon). Plus, I just got a new personalized air quality tester called the Atmo that I need to play with and finally....drum roll please... My first Mold Testing Kit... so... I'm def. gonna be busy trying to form opinions on some of this stuff over the coming weeks/months. I'm gonna want to know your opinions on your new, shiny, Camfil - esp. vs. your IQAir HPP! Thanks for the Heads up on the Sales Price (Looks like ONLY Dad is gonna get any presents THIS year, LOL!) and enjoy the Holidays! 👍

Would you recommend the coway airmega?

If you are asking about the best protection against ultrafine particles - I think having an IQAir Atem Desk unit or Airpura R414 right next to you - blowing in your facial region - is the best solution if someone is sitting at a desk... If you are asking something else - please let me know what that is, thanks!👍

I think the IQAir Atem Car is the best for particles and it has some carbon to help with VOCs. And I would pick the Amaircare Roomaide as my 2nd best option at this point in time. Good Luck!

@@AirPurificationEducation Thanks, of course they will be impossible to find in my Country - Australia, but I will look into it, thanks for taking the time, do you have Patreon?

@@AirPurificationEducation Thanks so much, hard to get those here, but will try, how big is the Amaircare Roomaide, its ok if it is big? There is one I was looking at the Philips GoPure GP523BLACKX1, at least its not a cup holder type, would it be poor compared to the Amaircare?

@@gregoryconran Here is the IQAir Australia website: www.iqair.com/au/ No Patreon but thanks!

​@@gregoryconran The Roomaid is 8.5" x 8.5" and 7.5" tall (21.5 cm x 21.5cm and 19 cm tall). Yes, I think it is probably good if it is at least a little big. *I don't know about the performance of the Philips GoPure but in my experience - the best air purifiers come from companies that almost exclusively focus on manufacturing only air purifiers. IQAir, Airpura, Austin Air, Camfil and Amaircare - all make good to very good air purifiers and that is all they make. * Companies like Philips that make a lot of different products and "oh by the way, we also have a great air purifier, too" - tend to not make high level air purifiers. I love my Philips shaver but it is much different to make a really good filtering air purifier. *Coway makes a bunch of different products, too. And they make decent air purifiers but they don't filter as well as some of the companies that focus exclusively on air purifiers.