Broan -NuTone(R) Steel Roof Cap, 3-1/4-Inch x 10-Inch or Up to 8-Inch Round Duct, Black

Select the Broan-NuTone(R) 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.