Alpine SBFD36 36 Inch Wide Return Air Support Box With Filter Slot

return air box with filter slot   Dan return linear slot diffuser

The 16x25x1 filter normally drops into a slot in the short horizontal run between the air intake downward duct and the furnace itself There

This is a return air box with filter grille and filter with a 20 round adapter for 20 flex duct which can be installed in a ceiling or side wall This video shows how to install a return air filter grille The grille was purchased from a local

aco slot drain detail In this case, the return vent filter will be the primary air filter After putting the new air filter in its slot, close the return vent This return air box features a 16 x 25 x 1 filter and measures wide, 28 deep, and 18 tall