Broan-NuTone Steel Wall Cap, 3-1/4-Inch x 10-Inch Duct, Black

Select the Broan-NuTone 639 Wall Cap to provide reliable wall ventilation. Features a black enamel finish and is designed for use with 3-1/4″ x 10″ duct. Includes a built-in back-draft damper, and protective bird screen to prevent small pests from entering duct.