Broan 636 Roof Vent 4.8" H X 9.25" W X 11" L Powder-Coated Steel Black BRAND NEW! THE BOX WAS OPENED AND INSPECTED. Select the Broan 636 Roof Cap to provide reliable rooftop ventilation. Features a black enamel finish and is designed for use with 3 in. or 4 in. round ducts. Includes a built-in back-draft damper, and protective bird screen to prevent small pests from entering duct. Designed for easy installation Compatible with either a 3 in. or 4 in. round duct Manufactured of steel with baked black enamel finish for added durability and resilience Includes built-in back draft damper and bird screen for increased protection Not to be used as dryer venting Corrugated No UL Listed No Color Black Packaging Type Boxed Gauge 24 Ga. Diameter 3.25" Product Type Duct Roof Cap Material Steel Each Weight 1.980 LB Alternative UPC 049403210210 Height 5.28 Length 11.28 Width 9.48 ECCN EAR99 Country Origin Code US Finish Powder-Coated Shape Square Vent Type Roof Screen Included Yes Wildlife Guard Yes