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Sandwich Style Insulated Round Duct, Rectangular, Door Width 16-1/2 In., Door Height 12-3/8 In., Duct Diameter 29 In. to 32 In., Material Steel, Finish Galvanized, Rough Opening Width 15-3/4 In., Rough Opening Height 11-7/16 In., Temp. Range 200 Degrees F max., Hinges None, Standards SMACNA, Includes InsulatedSpecification: Door Width: 16-1/2"Standards: SMACNADoor Height: 12-3/8"Finish: GalvanizedDuct Radius: 29" to 32"Item: Sandwich Style Insulated Round DuctIncludes: InsulatedHinges: NoneShape: RectangularTemp. Range: 200 Degrees F max.Rough Opening Height: 11-7/16"Rough Opening Width: 15-3/4"Material: Steel