RECTANGULAR DUCT & FITTINGS RETURN AIR DROPS

Furnace Return Air Plenum Fabrication return air box with filter slot The Polyaire Model EC-HF Return Air Egg Crate Grille & Filter is the one product which offers complete and simple service ability for all situations return of the dead slot Southwark SBF30 return air support box for 24 x 8 duct with filter slot

return air box with filter slot Can we see what the remainder of the return duct looks like that hooks up to that base box? air filter is possible in this case Left