Most HVAC filters are sized by people who are afraid of math. I'm not, sit back and relax and watch me rant. I didn't proof watch it, sorry, not sorry.
When I tell people how large their filters have to be they look at me like I’m a purple polkadotted unicorn with warts growing on my face. Before high school my father was teaching me to size a filter at 200 or below face velocity Per square foot. More people need to make more great informative videos about filters and face velocity and pressure loss they are greatly needed. Placing two or three large filters in parallel should be the norm not the abnormality
Thank-you! I’m not an HVAC expert, just an old, retired soldier, systems engineer...and woodworker, trying to keep the wood dust out of the air - and now, the smoke from all the wildfires in Canada, Michigan, Pennsylvania... I’ve been trying to get a better handle on “pressure loss” across a furnace filter. I’m having trouble finding data. I’m also wondering about the surface area of the filter media in different pleated filters, different thicknesses, and different MERV classes. Recently noticed that a five inch MERV 13 filter appeared to create a much greater “restriction” or pressure loss, than expected. Any guidance would be most appreciated. Thank-you!
We are getting a new HVAC system and they guy is insisting on putting in a 1” or 2” filter. I thought a 4” filter provided the least static pressure, and thus would maximize the life of my system. Who’s wrong? Thanks for the great info in the video!
Need more details, but most likely you are, unless you told him you were okay with adding another return. It’s possible your blower doesn’t have the power to overcome the pressure drop of one 4”. You solve this issue by adding multiple returns, lowering the pressure drop of the 4” to something your blower can handle.
@@winstagram1785 Thanks for the info! Totally makes sense. However, it turns out we had a miscommunication. The new 2" filer is 28" x 30"! So there is about the same sq. ft. of filter material in that as there is in a good 4" filter of the size it's replacing. So I'm happy with it. Feels like the larger size is a benefit somehow, but I can't quite settle on a specific reason...
