16-3/8 x 21-1/2 x 1 Electrostatic Washable Permanent A/C Furnace Air Filter 16-3/8x21-1/2x1

This filter measures EXACTLY 16-3/8 X 21-1/2 X 7/8 inches. Tired of having to remember to buy that furnace filter every 3 months? Tired of your house being dusty? Replace your disposable air filter with a washable electrostatic filter. It traps more dust and allergens, has a durable metal frame and comes with a lifetime warranty. Just hose off, allow to dry for 15 minutes and reinstall.