Sheet Metal Hack- Filter Slot in Return Air Duct

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Allow Furnace to process all ore types instead of just Black Metal Scrap and Flametal Ore Beehive Modify Beehive honey production speed

filter having a smooth end face and a large number of closely adjacent FURNACE John G Lewis , 1601 Leaird , Ann Arbor , Mich Original Comments142 ; How To Upgrade Your HVAC Air Filter To A 5” Honeywell -6 Month Or More

slot place Furnace Filter Slot Cover [Easy fix to HVAC Air Leak with One Hour Heating and Air Even though it's sized correctly, we still cover the filter perimeter with blue painters tape The ideal would be to bend up a metal cover, I'