634MRoof Cap in Black

  • 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 6" round duct
    • 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
  • 634M is rated 4.7 out of 5 by 12.
    Rated 5 out of 5 by from Great replacement cap Slide right into the existing duct. Shipped the same day and delivered on time.
    Date published: 2015-10-01
    Rated 5 out of 5 by from Great quality roof vent This is a solidly built vent and not one that you can generally find at the Big Box stores. So order it online so you have it. I like that it is black and has a 6" dia sleeve which you can attach your vent pipe or ducting to. Not all vents have the circular sleeve. I have used this unit several times. Good quality at a fair price!
    Date published: 2015-01-19
    Rated 3 out of 5 by from first experience with this type of product Item seems to be well made but was disappointed with packaging. The roof cap's flange was bent. No big deal but if it had been the top of the cap it would have been useless. This cap is connected to an in-line exhaust fan with 2 exhaust vents. It was pretty easy to install. The reason for the 3 star rating is that right now the wind is blowing 35-40mph and it's picking up the damper and letting wind in and is causing the built in dampers in the duct boxes to rattle, which is very aggravating. Being my first use of such product, I don't know if this is a common problem. Hope the wind dies down soon. Other than that I'm satisfied with product.
    Date published: 2013-01-30
    Rated 5 out of 5 by from FAST SHIPPING The fact that I needed this product in a pinch, they had it to me in two days and it is an excellent product.
    Date published: 2011-09-07
    Rated 5 out of 5 by from Works Perfect This item was exactly what I was looking for to vent out my exhaust hood over my cooktop. Works perfect.
    Date published: 2011-07-25
    Rated 4 out of 5 by from Good...but could be better First I'd like to highly recommend VentingDirect.com because my order was processed and sitting at my door within two days. Overall I'm pleased with the vent, however the vent flap does not seal properly on all sides and is basically useless. This is because the vent flap metal is very thin and has a curve in it which does not permit a good seal. I added extra gasket material on the sides of the frame that help, but the only real fix is to use a heavier gauge steel or plastic material that does not curve. I painted the vent to match my tan colored roof and it came out looking great. The inside collar is short, but it does work unless you have a very thick roof penetration area. Overall I'm happy with the vent, but the flap & seal design was a disappointment on an otherwise quality built product.
    Date published: 2011-06-19
    Rated 5 out of 5 by from Dust Roof Cap The dust roof cap is great. Easy to install, no additional parts were need. Completely satisfied with product. Shipping was at the speed of light. I never expected to receive this as quickly as we did. Wonderful experience all the way around. Thanks so much.
    Date published: 2010-12-13
    Rated 4 out of 5 by from well built I originally ordered this to use with a bath vent, but after the bath vent turned out to be smaller than advertised, I used it for my new range hood. It's a simple design and the screen is easily removable. I believe the damper is also replaceable if it were to be damaged. It could be improved if there were to be some sort of noise damping to keep the sound of rain from conducting into the kitchen. I'll probably solve that with a coat of rubber or something next summer.
    Date published: 2010-11-21
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  • Does this product work with 6" solid duct?

    I see the installation instructions only mention insulated flex duct.
    Asked by: Anonymous
    Thank you for your question on the 6” roof cap. Yes, this unit can be used with 6” rigid duct work.
    Answered by: BroanCustomerService
    Date published: 2013-10-23

    Spring for this cap

    Where do I get the spring for this cap. The house I purchased has this cap mounted in a side wall, and I need a spring to keep the backdraft damper closed, as there is about a 1" gap all the time. I am having a problem with the wind pushing down the pipe to the range hood. This causes frost on the pipe which later melts on to the stove.
    Asked by: Roger
    Thank you for your question on the model 634M roof cap. The 634M is a roof cap and has a built-in gravity damper. This unit is designed to be installed on a roof and not on a wall. There is no spring for this unit.
    Answered by: BroanCustomerService
    Date published: 2014-11-07


    Asked by: Anonymous
    Thank you for your question on the model 634M roof cap. The 634M is designed to be used on a sloped roof. Please contact the Technical Service Department at 800-637-1453 for further assistance.
    Answered by: BroanCustomerService
    Date published: 2014-05-23

    What transition piece do i need to attach to the ductwork?

    I purchased a vent that is for 6-8 inch or rectangular ducts (I plan to use a 6 inch round duct for my range ventilator) but there were no transition pieces inside like there were for the 4 inch units that I purchased at the same time. Is this a Broan piece or a duct piece?
    Asked by: Anonymous
    Thank you for your question on the model 634M roof cap. The model 634 roof cap is for 3 1/4" x 10" or up to 8" round duct. It could be possible that you have purchased the 634 and not the 634M. The 634M roof cap should include a 6" diameter collar that accepts 6" insulated flexible duct. If this was not with it contact the Technical Service Department at 800-637-1453 for assistance.
    Answered by: BroanCustomerService
    Date published: 2015-12-15

    Backdraft damper

    When using with a Broan PM500 Series Range Hood do I remove the backdraft damper since the hood already has one or leave both in place?
    Asked by: Anonymous
    Thank you for your question on the 634M roof cap to be used with the PM500 range hood. We recommend that you use both the damper that comes with the hood and the roof cap with the built-in back draft damper.
    Answered by: BroanCustomerService
    Date published: 2015-07-08
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