Nordic Pure 14x20x1 MERV 8 Tru Mini Pleat AC Furnace Air Filters, Box of 3 Actual size of air filter: 13 1/2 x 19 1/2 x 3/4 Low air flow resistance Change every 90 days Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the U.S.A