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Steel Roof Cap for 3-1/4" x 10" or up to 8" Round Duct with Backdraft Damper and Bird screen, Black

Model Number: 634

The 634 Steel Roof Cap is an easy-to-install vent for exhaust fans (range hoods, 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 up to 8" ducting and 3-1/4" x 10" 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
  • Durable steel with a black powder coat finish
  • Easy to install in new construction, replacement, or DIY applications
  • Compatible with 3-1/4" x 10" ducting or up to 8" round ducting

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