Review on Home Reusable Furnace Filter 20X30X1 by Joel Young

I have purchased 3 K&N filters for my 3 units. Each was a different size. The only problem I had was that they were a loose fit. I had to use sealant to keep them tight. When I say loose, I mean they fit the hole snugly, but are a bit too loose and can pull back a bit without sealing material. I added gasket material to the front of the filters to allow the screen to push the filters in place and hold them there. The paper filters I've used always fit just right. I still like them but I think they should have something to hold them in place without adding anything like I did.