Purchase a Furnace Return Air Box

return air box with filter slot
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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

Other places you may find the air filter are in a slot above or below your HVAC unit, or right behind the return grills in your home (see

return to the feature slot air out, but ALWAYS pulling air back TOWARDS it Your filter slot is almost always on this

return air support box with filter slot Return Air Egg Crate Grilles & Filter · Half Chevron Louvre Grilles WL-RC · Half Linear Slot Diffusers · Perforated Diffusers · Registers · Deflection