Fast shipping good quality
I recommend measuring the existing filter or the opening, my first order was the general numbers (20" x 25" x 4") from the website, filters are not exact and were smaller and did not fit tight enough to work in my air handler, I called Filterbuy and they took asked me to measure the opening so they could make them to fit, there was a cost adjustment, but reasonable and they refunded my initial payment and ask that I donate the filters that did not work to a charity, which i did. The filters were shipped very fast and I recieved them in a few days. Filters appear to be construct very well, I will reorder from them again.