Broan-NuTone 4.78 in. W X 12.75 in. L Black Steel Wall Vent

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.