12 Pack 14" X 25" X 1" Disposable Flat Panel Furnace Filters Pack Of Twelve Design May Vary 14 X 25" 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. Ul Class 2. Pack Of 12