Converting 1 filter frames to accept 4 filters

return air box with filter slot   Dan return to planet moolah slot machine

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

This is a return air box with filter grille and filter with a 14 round adapter for 14 flex duct which can be installed in a ceiling or side wall 14 X 14 Steel Return Air Filter Grille for 1 Filter - Removable FaceDoor - HVAC DUCT COVER - Flat Stamped Face -White

raja mbs slot 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 Return air filter box and grille 2 qty MERV 13 18x20x2 inch filters (5 Slot Diffusers & Returns · Spiral Duct Diffusers · T-Bar Plastic Supply