Furnace Return Air Plenum Fabrication

return air box with filter slot   Dan return linear slot diffuser

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

The air handler is a large metal box that houses the fan and its motor The filter usually fits in a slot on the air return side of the unit  The best place for a furnace and ac air filter is right in front of the equipment If you put a filter in the intake in wall or

slot machine sfx The focal point of todays video is to highlight how easy it is to make a filter slot in the return air I have attached some pictures that I took of the current condition of the inside of the box by sticking the phone into the air filter slot