The Broan-NuTone® 636AL aluminum roof cap is an easy-to-install vent for exhaust fans (bathroom, rec room, home gym, etc.). This cap provides reliable roof top ventilation and features both a back draft damper and bird screen, preventing outside air from entering the home and birds or small pests from entering duct work. Compatible with 3" and 4" ducting. Not suitable for dryer venting.
Built-in backdraft damper prevents outside air from entering home
Built-in bird screen prevents birds and other small animals from entering duct work
Constructed of durable aluminum
Easy to install in new construction, replacement, or DIY applications
Engineered to work with Broan NuTone 4 in. twist on duct connector, model DC4
Compatible with 3 in. and 4 in. round ducting
