Broan-NuTone 4.8in. H x 9.25in W x 11in L Powder-Coated Black Steel Roof Vent

Select the Broan-NuTone 636 roof cap to provide reliable rooftop ventilation. Features a black 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.