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Attic fans

Discussion in 'Off Topic' started by Oregonhunter5, Sep 28, 2015.

  1. Oregonhunter5

    Oregonhunter5 2C IDAHO Well-Known Member

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    Guys I'm getting my roof Done right now. It has a attic fan that's dead. Do you guys have attic fans? Do you think there needed? Warmer weather here. I heard if you had enough vents that's fine.
     
  2. oknow

    oknow amboy wa. Well-Known Member

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    You can cool down the whole house in a matter of a few min. With a attic fan.
     
  3. deadeye

    deadeye Albany,OR. Moderator Staff Member

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    I have one at each end of my house they are temperature controlled for on and off. They help extend the life of the composite type shingles, keep the house cooler in summer and make air conditioning more efficient.
     
  4. RicInOR

    RicInOR Washington County Bronze Supporter Bronze Supporter

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    What do you mean by Attic Fan?

    I had one growing up in the midwest, which pulled cool air thru the house from the basement.

    I have one in my house which vents just my attic area - draws outside air into the attic.

    This second kind I recommend here in the PNW.
     
  5. Ben Beckerich

    Ben Beckerich NW Oregon Bronze Supporter Bronze Supporter

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    As a roofing contractor here in the PNW......

    Aside from some specific applications, fans are gonna be completely useless in your typical residential roof. If you have standard attic airspace ventilators installed, the fans will just draw air through these, which can and probably will interfere with proper convective airflow. You want intake at the bottom and exhaust at the top and nothing interfering with that cross-ventilating system - if your upper exhaust units are busy sucking IN fresh air because of the fan, your roof will actually stay overall hotter than it would without the fan.

    There's some really good applications for electric fans, but they need to be engineered specific applications. Just throwing one up without any consideration for cross ventilation isn't gonna do you any good.
     
    clearconscience and albin25 like this.
  6. Dyjital

    Dyjital Albany, Ore Flavorite Member Bronze Supporter

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    http://www.energyvanguard.com/blog-...e-1-Reason-Power-Attic-Ventilators-Don-t-Help

    I agree with this, even if nobody else does.

     
  7. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Platinum Supporter Silver Supporter

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    One can ventilate the ceiling space but there needs to be a correct balance of the space pressure. Too negative and we pull air from below through the bathroom exhaust fans which have crappy backdraft dampers. Too positive in the attic and the same thing happens in reverse.
    An attic fan with a speed controller pulling outside air set to a neutral attic space pressure would be best in my not so humble opinion :)
     
  8. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Platinum Supporter Silver Supporter

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    Perhaps a Greenheck direct drive inline fan ducted from an appropriately sized OSA louver....shouldn't be too hard to sort out.
     
  9. albin25

    albin25 Lewiston Idaho Well-Known Member

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    Look for a "whole house fan" if you want to cool the house interior. they create a nice breeze through every open window and can cool a house down in minutes.
    Don't vent it into your attic though, do a through the wall installation. They're pretty big though, so it may be hard to find a spot to locate it.
     
  10. Ben Beckerich

    Ben Beckerich NW Oregon Bronze Supporter Bronze Supporter

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    Sure, there's all kinds of ways you can do it. But it must be designed specifically for the attic in question. No one-size-fits-all. Gable vents are generally heat exhaust, not intake, because you don't get any airflow across the underside of the roof deck, which is what you need to actually cool the shingles down, as well as keep that radiant heat from penetrating the interior living space.

    In any attic airspace ventilation system, your goal is to drag fresh air across the underside of your roof deck on it's way to exhaust.
     
  11. Oregonhunter5

    Oregonhunter5 2C IDAHO Well-Known Member

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    Topics like this interest me. Would that said, I have no gabel ends. Is t that when there's a peak? My roof slopes down on all sides. I thought my fan was to pull the hot air out of the attic?
     
  12. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Platinum Supporter Silver Supporter

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    I'm visualizing my own roof with vents at the top and vents around the perimeter. In the case of my attic which is vaulted, any size fan pulling OSA would tend to push out pretty well. I do these things for a living on a much larger scale fwiw.