True Blue 114201 14" X 20" X 1" Furnace Air Filter Size: 14" x 20" 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 Filter media has a skin backing and is evenly coated with a jelled adhesive