Filters are well made and easily installed. We use them in a 3 zone system, all different size returns. Filterbuy can supply all sizes, with the MERV rating of our choice and reminds me when to reorder. We were sent one package thar was the incorrect size. One phone call, the new ones were on the way and the old ones were donated to charity, at the company's cost. That is service!
The first batch of 3 filters were very slanted and unusable. You sent me a second batch which is almost as bad. Is there any quality control? Also the media which traps the dist is much thinner than the one i was replacing.