New Case of (12) Usa Made 18x24x1 Air Conditioner Furnace Filter Hvac Filters FURNACE HVAC FILTERS 18` X 24` X 1` BRAND NEW IN BOX!! SUPER SALE PRICE!! 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 Gelled Adhesive. FIBERGLASS Size Ins.=18 X 24 X 1