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Thread: New construction in Hawaii, exhaust fan routing

  1. #1

    Default New construction in Hawaii, exhaust fan routing

    I am building a new residence on the island of Oahu, on the west end in particular. It gets very warm here, with humidity averaging between 50-90 %, depending on the time of year. Of course, freezing temperatures or snow are not concerns here, however it can and does rain heavily in the spring.
    One of the bathrooms (approx. 60 sq, ft.) requires an exhaust fan to the outdoors.
    The 2 venting options are either roof or wall, as much as possible I'd rather not vent through the roof for leakage considerations.
    Roof construction is a simple hip design, with a 5/12 slope, exposed eaves with 2ft. on center 2X4 trusses.
    I would like to vent out of the eave blocking, which is of 2X6 const. and searched high and low for a vent cap in which I can mount in this blocking area.
    Normal rectangular wall caps are just as tall as the 2X6 blocking, 4" round caps even larger. The total duct run is approx. 12 ft., not including an elbow.
    Other than having a custom wall cap fabricated from sheet metal, I am at a dead end, can anyone offer suggestions?
    Thanks in advance !

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    I'd look into a through-the-wall fan. An alternative might be something like Fantec's central exhaust system. It can hook up multiple bathrooms and I think there's one version that can also hook up to your stove hood.

    With a good roof cap, leaking normally isn't an issue. Just make sure it has a good damper and is installed properly.

    I'd avoid sofits or eaves.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Plumber gear junkie's Avatar
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    See how others are doing this. Most problems are not isolated.
    BTW. I used to stay on Ohi St. in Wahiawa.

  4. #4

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    Quote Originally Posted by gear junkie View Post
    See how others are doing this. Most problems are not isolated.
    BTW. I used to stay on Ohi St. in Wahiawa.
    Aloha gear junkie,
    Did you mean Ohai St?

  5. #5
    Plumber gear junkie's Avatar
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    Can't remember, it was 15 years ago.

  6. #6

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    a fire fighter with a truss roof WOW.
    http://www.youtube.com/watch?v=Jo5ZtBXJiHo

    anyhow I would still go through the roof i think its a cleaner look and if the vent is well installed it won't leak. A side wall is really a much easier place for it to leak and you to not know it untill its too late

    Lou

  7. #7

    Wink Yeah, I know

    Quote Originally Posted by BigLou View Post
    a fire fighter with a truss roof WOW.
    http://www.youtube.com/watch?v=Jo5ZtBXJiHo

    anyhow I would still go through the roof i think its a cleaner look and if the vent is well installed it won't leak. A side wall is really a much easier place for it to leak and you to not know it untill its too late

    Lou
    Thanks Lou for the interesting and sobering video, but because of cost and logistic considerations, a truss roof was the only way to go.
    For those interested, I've decided to use a roof cap in this vent application, a wall vent is not an option.........

  8. #8

    Default Hmmmm

    Quote Originally Posted by gear junkie View Post
    Can't remember, it was 15 years ago.
    From what I gather gearjunkie, it seems as though you were in the Army back then and stationed @ Schofield?
    If I am correct on the street name (Ohai), it's still the ghettos of Wahiawa....

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