20x20x2 Fiberglass Air Filter MERV 4 Box of 12 FJS7_R9ODM35

One-Piece Moisture-Resistant Frame Media pads and support grilles are glued to the inside perimeter of the frame. This one-piece construction results in exceptional strength and rigidity. UL 900 Class 2 Listed Filters are flame resistant. When clean, air filters do not produce flames or extensive sparks when subjected to a flame exposure test. 60-80% Arrestance