Broan 636 Black Enamel 3" or 4" Round Duct Steel Roof Cap with Backdraft Damper

- Item #: BCI417815
Originally $27.92, You Save 37%
Black Enamel
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6550 In Stock
Ships Monday, October 27th


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Roof Cap - Model 636

  • For 3" Or 4" Round Duct
  • Built-In Backdraft Damper And Bird Screen
  • Steel Baked Black Enamel Finish

Additional Broan Links

Our SKU: Broan 636

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

  • Broan 636
    Black Enamel

*Denotes a finish or option that has been discontinued

Broan 636 Product Specifications

Specification Sheet
Installation Guide
Configuration Duct
Country Of Origin USA
Depth 11
Duct Diameter 3, 4
Function Roof Cap
Gauge 24
Height 4.375
Material Steel
Product Weight 2
Width 10.25

Installation Resource Center

Whether you are installing the product yourself or hiring a professional, our installation Resource Center has everything you need to get your project done. Visit the Installation Resource Center to get started.

Broan 636 Reviews

Rated 4 out of 5 by from Easy to install, works I installed this cap on the duct from a new exhaust fan in the master bath. The instructions were clear and easy to follow. There are no leaks in the roof and the vent works. I am happy. I plan to use the larger version of this on the new kitchen exhaust.
Date published: 2008-11-14
Rated 5 out of 5 by from Just Right Could not find what I needed in local stores. I should have started with your web site. It was just right. Right application and works like it should. Plus it looks great on my roof.
Date published: 2013-07-31
  • Can this be used in place of standard roof vents (replace existing ones)? I'm trying to prevent backflow due to an attic fan, but would like it to work naturally (exhaust out) if the attic fan is not on.

    A. Yes the Broan 636 can be used to as standard roof vents and it is meant to prevent the back flow of air.

  • Can it be used with a range exhuast?

    A. The Broan 636 is would work just fine if you were able to duct it down to 4" for your range.

  • Does the 636 come with a 4" duct collar connector?

    A. Yes, the Broan 636 can connect to a 3" or 4" duct.

  • Can it be used with a clothes dryer?

    A. The Broan 636 can be used with a clothes dryer. However, it has a bird screen that will catch bits from the dryer exhaust and will clog unless you either clean it occasionally or clip out the bird screen.

  • what is CRCQ stand for on the roof cap vents?

    A. The CRCQ on the Broan 636 stands for Cold-Rolled Commercial Quality.

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