3M™ Washable Cut-To-Fit Furnace Filter, 20 in x 25 in x 1 in (51 cm x 63.5 cm x 2.5 cm)

The 3M™ Washable Cut-to-Fit Furnace Filter is a washable 1-inch (2.5 cm) filter that can be cut to fit to any size up to 20 in x 25 in (51 cm x 63.5 cm). It is made from 100 percent synthetic polyester and can last up to 12 months when washed on a monthly basis. For best results, clean by vacuuming, rinsing and letting air dry before reinserting into the furnace bay.