Roof Cap with Built-In Damper for 3 in. or 4 in. Round Duct in Black

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.”,”highlights”:[“Built-in back-draft damper and bird screen for added protection”,”Constructed of durable, resilient steel with black enamel finish”,”Easy to install and/or replace existing product for DIY’ers”