Ducts, Dampers, Adapters & Caps

Broan-NuTone® Steel Wall Cap for 6" Round Duct with Backdraft Damper and Bird Screen, Black

The Broan-NuTone® 843BL 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 home 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 6" ducting. Not suitable for dryer venting.




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  • Spring loaded backdraft damper with padded damper zone reduces chatter in windy conditions
  • Built-in bird screen prevents birds and other small animals from entering duct work
  • Durable steel with a black powder coat finish
  • Easy to install in new construction, replacement, or DIY applications
  • Compatible with 6" round ducting
  • Not suitable for dryer venting.
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