The Polyester Throwaway filter is made for commercial or industrial use. It is constructed with a heavy duty chipboard frame that is thermally bonded to high-loft polyester media. The polyester media is a traditional multi-denier media designed for general applications. Bottle-cap metal backing is securely bonded to the frame providing dynamic durability. The non-migrating, light dry tackifier is on the blue downstream side to enhance dust retention. This media is an economical pre-filter to extend the life of your final filters or an adequate filter for less demanding, lower air flow applications. Its durable construction allows for maximum performance and reliability under adverse conditions. Polyester Throwaway air filters are recommended when basic filtration is required. Potential applications include: retail, commercial and industrial locations. Polyester Throwaway air filters are available for standard and custom size air handling units that have a depth of 2".