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Old 12-04-2015, 06:45 PM   #1
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Powered Attic Vents


Finishing up a job and the house is a double envelope home. Weird design but cool. Homeowner is thinking putting in 2 large automatic power vents that react to temperature and humidity.

Any suggestions or expience?
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Old 12-04-2015, 08:39 PM   #2
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Re: Powered Attic Vents


Does the house have any other intake or roof venting?

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Old 12-04-2015, 08:43 PM   #3
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Re: Powered Attic Vents


Has some 8x16" soffit vents. Had 6 big pot vents 12x12.

Design says these houses don't need winter ventilation, crazy design. There is a crawlspace under the basement and a gap in the trusses with insulation above and below, with an internal "eave" that allows air to circulate around the house creating a thermal buffer.
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Old 12-04-2015, 08:53 PM   #4
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Re: Powered Attic Vents


I built a house like this in 1978ish in Tahoe. Double north wall with a 16" space, two story house with a two story solarium that acted as the collector. Crawl space was super insulated and air circulated around the house. Wood stove for heat.

House worked great. Be careful about introducing too much air flow/movement that will disrupt the thermal effect of the air.

I had four low velocity fans in the top of my north wall that pulled the warm air from the solarium down through the double wall.

Had no problems with the place other than it was easy to get it too warm.

The house was destroyed by the Angora Fire at Tahoe.
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Old 12-04-2015, 09:08 PM   #5
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Re: Powered Attic Vents


Quote:
Originally Posted by griz View Post
I built a house like this in 1978ish in Tahoe. Double north wall with a 16" space, two story house with a two story solarium that acted as the collector. Crawl space was super insulated and air circulated around the house. Wood stove for heat.

House worked great. Be careful about introducing too much air flow/movement that will disrupt the thermal effect of the air.

I had four low velocity fans in the top of my north wall that pulled the warm air from the solarium down through the double wall.

Had no problems with the place other than it was easy to get it too warm.

The house was destroyed by the Angora Fire at Tahoe.
That is exactly why the homeowners dad, an energy efficiency contractor buddy of mine want the power vents that automatically react to humidity and temperature
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Old 12-04-2015, 09:09 PM   #6
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Re: Powered Attic Vents


And that sucks about the fire.

When the HO first looked at the house it was 95 outside and 75 inside....no AC
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Old 12-04-2015, 09:19 PM   #7
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Re: Powered Attic Vents


I'm just saying be careful with the high velocity.

Brain is fuzzy but it seems like I was advised not to use high velocity fans.

May have been to do with the winter climate & your situation is different.

Good Luck, curious to hear how it works out.
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Old 12-04-2015, 09:25 PM   #8
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Re: Powered Attic Vents


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Quote:
Originally Posted by griz View Post
I'm just saying be careful with the high velocity.

Brain is fuzzy but it seems like I was advised not to use high velocity fans.

May have been to do with the winter climate & your situation is different.

Good Luck, curious to hear how it works out.
Copy that, pretty wintery in Michigan...lol. I will pass that info along

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