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.