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About Sandwich Style Insulated Round Duct
Sandwich Style Insulated Round Duct, Rectangular, Door Width 16-1/2 In., Door Height 12-3/8 In., Duct Diameter 21 In. to 22 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 Insulated Access Door 16 In. x 12 In., Duct Diameter 25 In. to 28 In.Specification: Item: Sandwich Style Insulated Round DuctRough Opening Width: 15-3/4"Door Height: 12-3/8"Temp. Range: 200 Degrees F max.Includes: Insulated Access Door 16" x 12", Duct Diameter 25" to 28"Shape: RectangularRough Opening Height: 11-7/16"Standards: SMACNADoor Width: 16-1/2"Finish: GalvanizedDuct Radius: 21" to 22"Hinges: NoneMaterial: Steel
