Broan-NuTone 634 Steel Roof Cap for 3-1/4 x 10 or up to 8 Round Duct with Backdraft Damper and Bird screen, Black

Select the Broan-NuTone 634 Roof Cap to provide reliable rooftop ventilation. Features a black enamel finish and is designed for use with 3-1/4" x 10" or up to 8" round duct. Includes a built-in back-draft damper, and protective bird screen to prevent small pests from entering duct. Features: For pitched roof installation 24 GA. CRCQ steel, black powder coat paint finish Built-in backdraft damper and bird screen For 3¼" x 10" or up to 8" round duct