634Roof Cap in Black 8" Round Duct

  • Overview
  • Specifications
  • Reviews
  • Answers
  • Maximize the air and sound performance of your Broan ventilation fan or range hood using one of our wide variety of ducting accessories.

    • Footprint is 18-3/4" long x 14-1/4" wide for a well-balanced fit
    • Designed to fit with 3-1/4" x 10" or up to 8" round duct for flexible installation
    • A built-in, backdraft damper and bird screen provide a dependable roof cap you can count on
    • Roof cap is made of 24 gauge CRCQ steel construction with a black electrically-bonded epoxy finish for durability and long life
    • For use with Range Hoods, LoSone Fans and Bath Ventilation Fans
  • 634 is rated 3.0 out of 5 by 7.
    Rated 1 out of 5 by from Roof cap This roof cap does not make a closed connection with either an 8" round or a 3 1/4 x 10" with out an adapter. It is roughly a 10" square. I had to have an adapter made to attach to attach to the attic side to connect the duct. Broan didn't show any other part needed to complete the vent connections on the schematics.
    Date published: 2014-08-18
    Rated 3 out of 5 by from Did The Job Did not fit the 3-1/4 x 10 without snipping inside metal off and it did not sit down flat because of metal ridges. Not really satisfied with fit, but could find no other product for that size roof cap. If it had fit it would have been a good product.
    Date published: 2013-04-25
    Rated 2 out of 5 by from 8" Range Hood Roof Vent This hood was to be used with an 8" duct pipe. The vent should have come with an adapter to mate directly to this size pipe. The other (2) 6" roof vents (Broan model 634M) that I purchased had 6" collars to mate with the pipe. This would have made a far more secure, and better sealed attachment to the range hood duct. As a result, I needed to fricate a collar that could be attached to the underside of the roof sheeting.
    Date published: 2012-09-20
    Rated 5 out of 5 by from exactly what we needed at the right price!! We are a non-profit weatherization agency and getting the products we use at a great price is essencial to maximizing the number of people we can help!! Appreciate the great prices and fast delivery!!
    Date published: 2012-04-10
    Rated 4 out of 5 by from Broan Roof Vent Well-built for the most part, Bird screening falls out too easily.
    Date published: 2011-09-01
    Rated 1 out of 5 by from stuck open- stuck closed The flapper does not open/close properly. It also does not seal when closed.
    Date published: 2010-08-30
    Rated 5 out of 5 by from Just what I needed The item work perfectly for me and was shipped super fast. Thanks!
    Date published: 2008-09-29
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  • can I use this roof cap to vent a dryer?

    I need to replace a dryer roof vent. Can I use the 634 vent with a dryer?
    Asked by: Woodstock
    Thank you for your question on the model 634 roof cap. The normal application for this roof vent is as a termination for a bath fan. It may, however, be used to terminate the ducting for a clothes dryer if the bird screen is removed since lint build-up on the screen could pose a safety hazard. This conditional approval is given only if the clothes dryer manufactuerer's instructions permit roof ducting. Recognizing that clothes dryers are normally ducted through a wall with a short length of horizontal duct, we cannot be responsible for loss in dryer performance that may occur as a result of the duct run needed to utilize the 636 roof cap. Please contact Technical Support with further questions at 800-637-1453.
    Answered by: BroanCustomerService
    Date published: 2016-07-20

    EX-AF 8120 8-Inch Diameter Flex Pipe

    Will Speedi-Products EX-AF 8120 8-Inch Diameter by 10-Feet Aluminum Flex Pipe directly fit to this roof cap, or is an adapter needed?
    Asked by: Ej
    Thank you for your question on the model 634 roof cap. The 634 can be used with 3-1/4” x 10” rectangular or up to 8” round duct work. Since the roof cap fits over the duct work and does not actually connect to the duct, you should be able to use any duct work within the size parameters of the cap.
    Answered by: BroanCustomerService
    Date published: 2014-06-18

    Can the 634 cap be used as a dryer vent if the screen is removed?

    Asked by: BP
    Thank you for your question on the model 634 roof cap. There is no objection in the installation instructions or spec sheet for using the 634 for dryer venting.
    Answered by: BroanCustomerService
    Date published: 2013-10-23

    Leak in driving rain

    I recently had your 634 vent installed on a west facing roof. We experienced a hard driving rain from the west and had water leak down inside our range hood on to our range. We did not experience any leakage with previous rain storms. The cap seems to be installed according to your instructions except that the top edge was not sealed. It is possible that this was the cause of leak and sealing it will correct the problem? I suspect that the problem could be rain being driven into the cap by the high wind. If this is the cause, do you offer an extension kit that would offer further protection?
    Asked by: Greg
    Thank you for your question on the model 634 roof cap. There is no extension available for this cap. Please contact the Technical Service Department at 800-637-1453 for assistance.
    Answered by: BroanCustomerService
    Date published: 2015-08-03

    net free area opening?

    What is the net free area of the opening so I can determine my maximum CFM and static pressures in sizing the connecting duct-work? Thank You, Michael
    Asked by: Mike737
    Thank you for your question on the net free area of the 634. We checked with our Engineering Department and they stated that it sounds like you may need the air performance curves for this roof cap. Please contact our Technical Support Department directly at 800-637-1453 and they will provide you with the information you are looking for.
    Answered by: BroanCustomerService
    Date published: 2017-01-05
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