22x22x2 MERV 11 Pleated Air Filter

I saw an interesting way to purify a large volume of air on an episode of ASK THIS OLD HOUSE. They used four of these filters taped together as a square box with the air flow facing in.Then they mounted a 22" square 3 speed fan on the top drawing the air through the filters and out the top. Sealing off the open bottom of this arrangement allowed a large volume of air to pass through the filters removing dust and germs. I purchased these filters to build and test this system to try and eliminate dust from our pellet furnace. So far it seems to be working great.

The filters work Wonderful there is only one problem they seem to not fit correctly we have to push a lot to get them in but otherwise they good Maybe am buying them to large maybe they have to be 22221 I don't know can you please email me and let me know what I am doing wrong thank you

Easy to use and prompt reply back to a question I had about the product. Highly recommend this company and the filters are exactly what one would expect.

Good quality, prompt delivery

I ordered hard to find filters and they arrived promptly. I was happy to verify they work great as I have a smartphone app that provides air quality info.