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Steel Roof Cap for 8" to 10" Round Duct with Backdraft Damper and Bird Screen, Black

Model Number: 437

The 437 Steel Roof Cap is an easy-to-install vent for high capacity exhaust fans up to 1200 CFM (range hoods, light commercial, bathroom). 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 fans up to 1200 CFM. Not suitable for dryer venting.


  • For high capacity fans up to 1200 CFM
  • 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 3-1/4" x 10" ducting or up to 8" round ducting

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