The Polyester Disposable filter is constructed with a frame that is thermally bonded to a high-loft polystrand media. Bottle-cap metal backing is securely bonded to the frame providing dynamic durability. The non-migrating, light dry tackifier is on the white 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.