16x20x1, Percisionaire Ez Flow Ii Front Panel Merv 4, 10055.011620, Pack12 16 x 20 x 1 in. EZ Flow II Spun Fiberglass Disposable Furnace Filter. Flat Panel&#44; No Metal Media Retainers. Up To MERV Rating 4&#44; 30 Day Filter. Effective Against Dust&#47;Lint. Pack of 12.