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Activator series air filters have multi-stage media construction—layers of multi-denier polyester fibers capture particles throughout the filter's depth. This prevents wasteful "face-loading," increases dust holding capacity, and maximizes the service life of the filter.

The filters are manufactured in 2-, 3-, and 4-ply models to meet the requirements of MERV 6, 7, and 8 respectively. Media layers are heat-sealed around a robust, nine-gauge internal wire frame. Cross wire supports welded to the frame enhance strength in service and hold the media firmly in place.
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