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The vast majority of furnace installations are completed with shop-made return boots that incorporate a slot into which the furnace filter is

slot , said first element having a second edge extending into said channel , and a second porous absor- bent filter element obturating said passageway It eliminates air leakage at the filter slotdoor to improve indoor air quality and reduce energy consumption Features: Cover furnace filter slotdoor; Block

the mass lottery We've seen some great improvements from these little filter covers An easy fix you can do Hinged Air Returns - Return Air Vent Covers