I Built an Air Cleaner for $7 

Finally, a box filter build that doesn't look like a last minute school project - it looks amazing!

Your trick using biscuits to pivot in and out for closure, plus using a panel there, just totally changed my Corsi-Rosenthal box design. You've saved me tons of finagling constructing slots to slide new filters into, in my original design. THANK YOU.

Nicely done. I can see putting something like this in my new shop.

Not knocking this, but it's a little misleading when YT vids say "I built x for x$," and then you find out they already had plywood, a box fan, other parts. The build doesn't cost that. A more honest approach would be including the actual cost for someone else to build it in the title.

Nice job and thanks. Gonna do this myself

Really simple, straight-forward plan. I LOVED IT!!! Also, loved seeing some FastCap products being used in the video. Paul and his crew at FastCap are wonderful people and it is a GREAT company. (And no I don't work for them 🙂) Great video 👍

Well done!

Looks great bro super smart idea 💡 👌

Been watching a lot of videos on these type of air filter system. Going to make one very soon. Nice job

Nice job great idea

You’re a true craftsman. The closest I get to being a craftsman is buying Craftsman Tools at garage sales. You have a gift from God.

Some great tips here- drawing circles, novel use of biscuits. Good build. Re insta Loving the switch, could you have liberated the original switch housing from the frame? I’ve done that a couple of times. Some part of it is bound to be flat so you can attach it to your new frame.

Nice job, but you coulda just taped the filter to the back of the fan. Better to use a thicker filter too.

The cheap furnace filters are really not going to catch most of the fine saw dust particles. Get some MERV-13 air filters, Amazon has them for the lowest price I have been able to find. A MERV-13 filter is far superior to the filters you used here. I use three of these in my shop, and the air gets cleaned up really fast. I like your enclosure, but I just duct tape my filters onto the fans at the corners.

Nice design

This build was a real breath of fresh air. 😏

Need something like this in my lab.

Very good and cheap but i would flip the box fan so i blows air out and also cover the box fan corners so the air wont escape.

Very interesting video. Thanks for sharing. What kind of fans are suitable for such air cleaners? I have some smaller ones (from electric heaters of which the heating elements are broken). Maybe I can try them out. It should be better than nothing, I guess.

Refreshing😁

7$!? All i need now is power tools, a crazy table saw, glue, nails, a box fan, filters, plenty of wood and a large work shop.... life will be so much better after i have my very own 7$ dollar air cleaner!

Well you do have plenty of tools nice job

4:55 - radius tip = most valuable part of this video. :)

All u need r 2 pieces of scotch tap. Attatch filters to back of fan. I piece of tape at the top of the fan attaching to the filter. The back side. doesn’t have to be this complicated.

Build a shroud out of the box the fan came in and slap a 20" filter on it. Or just duct tape ..

The biscuit latch is a good idea.

Man, i can't believe all of the negative comments on this video. Yes, it could've been built many different ways, and all materials if purchased together to build would definitely be over the $7 price. He already had materials laying around and he built it to what he wanted. If you can do a better job, then by all means build one and post your video for all the haters to criticize your stuff like you're doing here. I think you done a great job building it, and keep up the good work!

7:55 - Second most valuable take away.

Nice

At $7, your filters will not adequately remove the fine dust particles.

Have u thought of a 4” or 5” thick fine filter? The pre filter is a great idea and necessary.

This is a nice and a very useful shop instrument. I do however think that your build was over-engineered. It could be simplified so there is not so much waste of plywood. Also, if you have permanently hooked up the fan to the lamp, you could have just skipped installing that switch on the outside. Keep the videos coming.

Amazing video, I was gonna make one with a 4” Merv 14 filter followed by a 1” Merv 8 to catch the big stuff like you. I’ve read that if you stack filters if can restrict airflow, do you have any advice?

I do alot of work with mdf and man do I hate the super fine dust from it..! Been converting our garage into a dedicated wood shop over the last yr. I seen alot of these diy builds and they all say they work great but in all reality do they work as great as they say..? How has yours performed?

I'm also boxing in my window mounted box fan, but I'm doing it to add a hose/air duct to carry fresh air to the intake fans on my pc. The problem is, I can't find any information or projects about doing this, I don't know if it will even work, any ideas???🤷‍♂️

When do you take the nails out of the plywood? You mentioned putting in nails temporarily so I wasn't sure when you take those out?

Nice video. Are you still using the 2 filter method?

You mentioned using a motion sensor to automagically turn on your lighting and air cleaner. Can you share a link or other info so I find a motion sensor switch for my shop? THANKS

Cool video. It’s awesome you were able to build it for 7 bucks cuz you had stuff laying around but the title is a little misleading. Those materials and tools are not cheap and not everyone has access to them.

👍

Question: what are the most common sizes of filters? 20 x 20 and 20 x 30 seem to be, but I’ve never shopped for them.

If you add up your labor time, machines and location rent where yo built that Air purifier, I bet its not going to come down to $7.

I am little confused. Where did you put the filters on the front or on the back of the fan?

👍🙏

hey where did u get that 20x20in under $7

9:44

So that new plank is scrap wood, a? 7$ you say? Bullshido!

air cleaner for $7 ? its easy to say whe you have tools to cut the box wich you said in the introduction you already had ...

Nice clickbait title. Here's your comment for the algorithm.

I built one that uses 4 merv 13 filters and it works great. Yours is not a 7 dollar build even though it looks great. Those other materials and the fan are things now dedicated to this new purpose. Unless the plywood and fan were gifted to you, they are not free and need to be added to the cost of the build. But the titles looks better with a lower dollar amount so off you went after those clicks.

yaeh right cost you $7 with $5000 tools and experience,,which everybody has that

Not really cleaning the air you should have put a filter in front and one in back

That's a lot of cheap wood

For low cost and low effort, you could have just stuck the filter onto the original fan frame with some duct tape... job done. Just saying.

I really like this build. That being said, this did not cost $7. It cost only $7 MORE than you already paid for the other materials. I abhor this kind of deception that have absolutely become the norm. It is good information inherently and should not rest on the shoulders of fraudulent clickbait

$ 7 dollar fan for what you have to move a lot of air in a short amount of time like two air exchanges pre minute