Product_description: ["'Sandwich Style High Temp Round Duct, Rectangular, Door Width 12-1/2 In., Door Height 8-9/16 In., Duct Radius 17 In. to 18 In., Material Steel, Finish Galvanized, Rough Opening Width 11-11/16 In., Rough Opening Height 7-5/8 In., Temp. Range 2300 Degrees F max., Hinges None, Standards NFPA101, Includes Ceramic Fiber Gasket'"]

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