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Aluminum Wall Cap for 8" Round Duct with Backdraft Damper

Model Number: 643

The 643 Aluminum Wall Cap is a robust, easy-to-install vent for exhaust fans (range hood, bathroom, rec room, home gym, etc.). This cap provides reliable ventilation and features a back draft damper, preventing outside air from entering the home. Compatible with 8" ducting. Not suitable for dryer venting.


  • Built-in backdraft damper prevents outside air from entering home
  • Constructed of durable aluminum
  • Easy to install in new construction, replacement, or DIY applications
  • Integrated 6" aluminum duct connector
  • Compatible with 8" round ducting

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