Metal Air Filters for sale

The HVAC contractor argued and said that a filter cover was not required at this location and it would not hurt anything to leave it open He

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metal slot Shows fabrication of sheet metal filter slot for mobile home electric furnace that had no proper

metal furnace filter slot cover Could I cover the gap by laying say a 5 x 25 inch piece of sheet metal under the edge of the 25 x 25 x 2 inch filter to cover the gap (or would