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 inch or up to 8 inch round duct.For pitched roof installation,Easy to install in new construction, replacement, or DIY applications,Includes a built-in back draft damper, and protective bird screen to prevent small pests from entering duct
