8.3 Air box air ducts There are 2 air ducts that feed theairboxon the left and right sides. They come up directly under the pollen filters. Each duct has 3 plastic snap connectors that must be depressed before theairboxcan be removed. If you are not careful, the plastic ducts can crack...
areturn air box: this is just a big sheet metal box that you set your furnace on. It serves as a big air scoop where you can connect all your return air ducts, and it also has a convenient slot to hold the air filter. asupply air plenumto handle the heated air on its way out....