Where Is My Furnace Filter Located?

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

Why does the furnace not come with a filter slot cover? We recently got a question asking us

furnace filter slot Sometimes the sheet metal is formed into a slot so that the sheet metal cover that ought to go in there can be slid into place Other times

how much is infinix hot 8 in slot AllergyZone - FilterLock Filter Slot Seal – Seal Cover for Any 1” Furnace Filter, Up To 25” Long 92 reviews $ $