EZ Flow II 18x20x1-In. Flat Panel Spun Fiberglass Air Filter, 30 Days - Pack of 12

True Blue 18x20x1" Fiberglass MERV Rating 2 30-Day Filter. It is effective against pollen and dust/lint. This filter reduces dust and dirt buildup in air ducts, air conditioners and furnaces. The EZ Flow II is made from heavy chipboard in a one-piece design. The filtering media is continuous filament spun glass and is made to function without a retainer, by adhering the frame directly to the media which has a light skin to make it self-retaining. UL Classified.