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HT pocket filters are made with a three ply polyester media design. The upstream layer consists of coarser fibers with a more open structure followed by a denser layer of finer fibers for greater depth loading. The downstream layer is a needled media forming a final barrier to catch dirt particles. The media is sewn around an internal wire support from that forms a built in gasket. The filters are automatically sealed when installed to prevent leakage. No bypass. The high loft polyester media holds is extended shape at all times, even with no air flow. No sagging or drooping.

The media is applied with pressure sensitive tack to retain collected dirt particles. No other style of pocket filter is so fast and easy to install. Simply push the filter into the frame or slide it into the track on side access housings. No clips or latches are required.