Sandwich Style Insulated Round Duct, Rectangular, Door Width 23 1/4 in, Door Height 17 1/2 in, Duct Diameter 41 in to 44 in, Material Steel, Finish Galvanized, Rough Opening Width 23 1/4 in, Rough Opening Height 17 1/2 in, Temp. Range 200 Degrees F max, Hinges None, Standards SMACNA, Includes Insulated
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