Filters need to be closer to 12x24. I have to use a wedge to hold the filter in place. When ac unit starts and stops filter flops around and makes noise. Return in bedroom makes it hard to sleep. Probably wont be buying any more.
The ducts in my house require 2 filter sizes not available at home supply stores. I was very happy to find these available on line. They both fit, and were delivered promptly. They are made in America. Ive gone through several deliveries, and they seem to work (asthma and allergies are better indoors), and they all fit. They look the same as commercial brands