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Web learn how sheet metal casings and plenums are fabricated and installed according to smacna and how to. Web get free shipping on qualified plenums & air returns products or buy online pick up in store today in the heating, venting &. Web the plenum is a large, square duct that sits on top of the air handler unit or evaparator coil. I bend the metal cross brakes. Web in this hvac training video, i show how to make a sheet metal plenum in the field! Metal pipe, elbows, ductwork, register boots, insulated boxes, collars, flexible. Web sheet metal duct pipe & fittings / duct plenums. Seattle, 3440 6th ave s. The top end is sealed with an end. Web sheet metal products for the hvac industry.