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This Imperial Stack Duct line is used for distribution of supply and return air to branch lines throughout a forced-air system. The 3 1/4-in by 24-in duct is assembled by snapping together the 2 “L” sections using Drive and “S” cleats (sold separately) to form one rectangular section. This stack duct is made from 30-gauge galvanized steel for rust resistance and long-lasting durability. Its design is suitable for use in most heating, venting and air conditioning applications.For all heating, air conditioning and venting where rigid pipe is required,Used between wall studs for venting, heating and air conditioning supply and return duct,Snap-lock,Outside surface smooth
