Select the Broan 636 Roof Cap to provide reliable rooftop ventilation. Features a black enamel finish and is designed for use with 3 inch or 4 inch round ducts. Includes a built-in back-draft damper and protective bird screen to prevent small pests from entering duct.
Designed for easy installation
Compatible with either a 3 inch or 4 inch round duct
Manufactured of steel with baked black enamel finish for added durability and resilience