Broan-NuTone 4.78 in. W X 12.75 in. L Black Steel Wall Vent 639

Broan 639 3-1/4 x 10 Inch Duct Wall Cap with Backdraft Damper and Bird Screen The Broan-NuTone® 639 Steel Wall Cap is a robust, easy-to-install vent for exhaust fans (bathroom, range hood, rec room, home gym, etc.). This cap provides reliable ventilation and features both a back draft damper and bird screen, preventing outside air from entering the... morehome and birds or small pests from entering duct work. The back draft damper is spring loaded and features a padded damper zone, which reduce noise from wind induced chatter.Compatible with 3-1/4" x 10" ducting. Not suitable for dryer venting.Features:Spring loaded backdraft damper with padded damper zone reduces chatter in windy conditionsBuilt-in bird screen prevents birds and other small animals from entering duct workConstructed of durable steel for premium durabilityEasy to install in new construction, replacement, or DIY applicationsIntegrated 5" steel duct connectorCompatible with 3-1/4" x 10" ductingSpecifications:Depth: 12-3/4"Height: 5.63"Depth: 12-3/4"Duct Size: 3-1/4" x 10"Material: Steel Wall Cap Black