AAF 121A21A1A12 Panel Filter, 21 in L, 21 in W

Panel filter utilizing the Purolator monobond concept of a one-piece frame sealed to the media using heat and pressure. Fiberglass media is evenly coated with a gel adhesive to prevent finer particle migration. Full depth loading and high dust holding capacity. Filter media has a skin backing and is evenly coated with a jelled adhesive. UL Class 2.