heil carbon postfilters 101813_nominal_thickness_3 3 to 1 micron (75%

3 to 1 micron (75% captured)

Replace filter once every 6 months for optimum performance

This filter was specifically designed for an easy retrofit into a typical 2" furnace filter track to increase efficiency

28 point die-cut frame with diagonal supports bonded to the media pack for extra strength

heil carbon postfilters 101813_nominal_thickness_3 3 to 1 micron (75%Package contains 1 set of 3 filter, giving one filter change. Carbon postfilters to remove odours and gases. These filters should be installed in the small track closest to the furnace, on the air outflow side of the air cleaner cabinet. The filters should be spaced evenly from the back to the front of the cabinet, with gaps between the filters. By design, the filters will not fill the entire depth of the cabinet. Lifespan: 3 6 months