Sandwich Style High Temp Round Duct, Rectangular, Door Width 16 1/2 in, Door Height 12 3/8 in, Duct Diameter 23 in to 24 in, Material Steel, Finish Galvanized, Rough Opening Width 15 3/4 in, Rough Opening Height 11 7/16 in, Temp. Range 2300 Degrees F max, Hinges None, Standards NFPA104, Includes Ceramic Fiber Gasket
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