Broan 643 8" Round Duct Aluminum Wall Cap with Damper

- Item #: BCI417821

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Wall Cap - Model 643

  • For 8" Round Duct
  • Built-In Backdraft Damper
  • Aluminum Natural Finish

Additional Broan Links

Our SKU: Broan 643

This product is listed under the following manufacturer number(s):

  • Broan 643

*Denotes a finish or option that has been discontinued

Broan 643 Product Specifications

Specification Sheet
Configuration Duct
Country Of Origin USA
Duct Diameter 8
Function Damper, Wall Cap
Height 13
Material Aluminum
Product Weight 2.5
Projection 6
Width 12.5

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Broan 643 Reviews

Rated 1 out of 5 by from Very noisy in any wind The banging noise from the damper flapping in the wind is annoying to say the least. Will replace this wall cap with one outfitted with a spring to keep out the wind.
Date published: 2014-04-19
Rated 4 out of 5 by from quality product This wall cap was the only one available in 8 inch so I didn't have any choice however, it is well constructed. I have two minor complaints. There is no sping to keep it from flapping in the wind nor is there any rubber or foam to decrease the noise when it flaps.
Date published: 2012-11-29
Rated 5 out of 5 by from Prompt and Easy I ordered a vent wall cap and it was a very easy purchase. It was a good price and arrived promptly. I am very satisfied and would buy here again.
Date published: 2011-05-29
  • Does it have a bug screen? And how does it attach to the wall / side of house?

    A. The Broan 643 has a damper. It goes directly into the venting pipe coming through the wall.
  • Is the Broan 643 for use for exterior brick wall with 8" dia. vent for a gas range hood vent for exterior vent cap?

    A. The Broan 643 is compatible with brick wall installations.
  • Is the damper spring-loaded?

    A. The Broan 643 has a gravity damper that is not spring-loaded.

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