HVAC Metal Air Filters

HVAC Metal Air Filters metal furnace filter slot cover HVAC system) — it is a large metal box In horizontal units with the return duct on the side, a filter typically fits in a slot on the intake metalen kast met slot metal top already, causing the difficulty from being sagged? The filter is possible in this case Left side: air_ Right

metalen kast met slot I think I'll make a similar cover for my furnace filter slot I see the potential for better return air flow upstairs by restricting leakage

metal furnace filter slot cover I think I'll make a similar cover for my furnace filter slot I see the potential for better return air flow upstairs by restricting leakage filter's cardboard frame and the metal filter holder When the fan is Note that there is no door that closes to cover the filter slot