636Roof Cap, Black, 3" or 4" Round Duct

  • Overview
  • Specifications
  • Reviews
  • Answers
  • For 3" or 4" round duct.
    • Built-in backdraft damper and bird screen
    • Steel baked black enamel finish
  • 636 is rated 4.5 out of 5 by 4.
    Rated 4 out of 5 by from As desribed Not the sexiest thing to write a review about but it does the job and seems well made. I have it on my roof and, so far so good.
    Date published: 2016-11-02
    Rated 5 out of 5 by from As a remodeling contractor we use these all the time to fix peoples exhaust fans which have previously been dumping into the attic causing, mold , insulation damage, wood rot, etc. Its an inexpensive fix that works great.
    Date published: 2015-01-22
    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
    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
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  • why does rain come into vent?

    I installed one of these in a new house in 2007 for a bathroom fan. In about 2012 the ceiling below it started leaking. I concluded that a driving rain lifts the flapper and guessing the tubing contained the H2O leaks for several years before deteriorating. I thought the flap went bad and replaced the vent, twice. Same thing. It takes the kind of driving rain we get about once a year in Iowa, like last night. 6/12 pitch roof and vent of course faces the prevailing winds. I could get in the attic and replace the deteriorated vent tubing, but that seems like a Band-Aid rather than a fix. I could also move the vent to the gable end which would be a pain, and technically the vent is more effective through the roof. I am a landlord and house flipper and have done quite a few roof and vents without issue. this one has me stumped.
    Asked by: Iowa Dave
    Edited response 08/2017. Thank you for your question on the model 636 roof cap. Yes, it is possible during strong storms or very windy days that rain can be blown into the roof or wall cap. If this unit has a back draft damper it would definitely help but weather is something that cannot be controlled, so it may not completely stop this from happening. If you are experiencing water leaking from the grille of your ventilation fan, this is normally due to cold duct work, improper installation, or a problem with the seal on a wall or roof vent. Insulated duct work can help solve the condensation problems and running the fan longer will ensure moisture is completely removed from the duct. Duct work should slope down toward a wall vent to direct condensation out the exterior vent opening rather than back into the housing. You always having the option of moving the vent so it doesn't face prevailing winds or using a wall cap instead of a roof cap.
    Answered by: BroanCustomerService
    Date published: 2017-08-17

    problem with rain getting into

    I have this 636 exhaust fan when the rain comes n the right direction it bounces off roof into the fan. In turn it leaks into my bath , how can I create a extension to install on unit to stop this.
    Asked by: Mickey52
    Edited response 08/2017. Thank you for your question on the model 636 roof cap. Yes, it is possible during strong storms or very windy days that rain can be blown into the roof or wall cap. If this unit has a back draft damper it would definitely help but weather is something that cannot be controlled, so it may not completely stop this from happening. If you are experiencing water leaking from the grille of your ventilation fan, this is normally due to cold duct work, improper installation, or a problem with the seal on a wall or roof vent. Insulated duct work can help solve the condensation problems and running the fan longer will ensure moisture is completely removed from the duct. Duct work should slope down toward a wall vent to direct condensation out the exterior vent opening rather than back into the housing. You always having the option of moving the vent so it doesn't face prevailing winds or using a wall cap instead of a roof cap.
    Answered by: BroanCustomerService
    Date published: 2017-08-17

    Can the 636 be used as a side wall termination?

    Asked by: Steeve
    Thank you for your question on the model 636 roof cap. The 636 is designed for roof mounting only. We would not recommend trying to use it on a wall.
    Answered by: BroanCustomerService
    Date published: 2014-05-23

    NFA

    What is the net free area of this vent in inches?
    Asked by: Jim
    Thank you for your question on the Broan 636 roof Cap. I understand Technical support answered your question over the phone. If you have further questions please contact our Technical Support directly at 800-637-1453.
    Answered by: BroanCustomerService
    Date published: 2017-04-17

    Water Leaking

    Hello, We install these roof vents in our new construction properties. We have had several complaints about water leaking during storms. Could you please give me an explanation for this that I can pass onto our homeowners? It is my understanding that when we get sideways wind and rain, it is possible for that moisture to get into the roof vent and leak down into the home. Thanks! CA
    Asked by: CA
    Thank you for your question on the model 636 roof cap. Yes, it is possible during strong storms or very windy days that rain can be blown into the roof or wall cap. If this unit has a back draft damper it would definitely help but weather is something that cannot be controlled, so it may not completely stop this from happening. If your customers are experiencing water leaking from the grille of their ventilation fan, this is normally due to cold duct work, improper installation, or a problem with the seal on a wall or roof vent. Insulated duct work can help solve the condensation problems and running the fan longer will ensure moisture is completely removed from the duct. Ductwork should slope down toward a wall vent to direct condensation out the exterior vent opening rather than back into the housing. For further questions, please contact Technical directly at 800-637-1453.
    Answered by: BroanCustomerService
    Date published: 2016-02-10
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