Sandwich Style High Temp Round Duct Rectangular Door Width 23-1/4 In. Door Height 17-1/2 In. Duct Radius 29 in to 32 In. Material Steel Finish Galvanized Rough Opening Width 23-1/4 In. Rough Opening Height 17-1/2 In. Temp Range 2300 Degrees F max. Hinges None Standards NFPA105 Includes Ceramic Fiber Gasket
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