Don’t worry, this is the last time you’ll ever have to check. Clean Air Club carries most common filter sizes like 16x25x1, 18x18x1, 20x25x1, 25x25x1, 16x25x4, and 20x25x4; however, we have access to Canadian-made filters of almost any size. If for some reason we don’t have what you need, fill out our handy size request form and let us get you up and running. Need some extra help finding your size? Check out our tips in the FAQ or contact us at email@example.com.