heil carbon postfilters Size:15 1 8" x 5" x 5 16" 3 to 1 micron (75% 97 efficiency True HEPA 3 to 1 micron (75% captured) Constructed using an expanded aluminum mesh pad covered with a special clay like coating that absorbs water and removes mineral deposits These filters should be installed in the small track closest to the furnace giving one filter change
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