Protect Plus Air 125301 Fiberglass Furnace Air Filter, 25" X 30" X 1" Fiberglass Size: 25" x 30" x 1" 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