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Old 05-06-2010, 11:24 PM   #16
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electric roof vents


HD has their solar gable vent fan on sale for 217 but I believe the CFM rating is significantly less that the hardwired version. Not finding the info on it now though.

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Old 05-07-2010, 12:13 AM   #17
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I didn't realize you were from Illinois, elsewhere in the country it can be simpler and cheaper:

For a gable fan:
$70 Fan
$12 25' 14-2 Romex
box, face, a couple clamps, and connectors
Some screws from the mounting kit
Drywall patch and compount where you put your foot between two joists... this is DIY, right? Oh wait, I still have to patch that hole in my own kitchen ceiling

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$250 fan
waterproof electrical grease
ladder high enough to get to your Gable vent and eave
Wasp spray... mattress to land on...
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Old 05-07-2010, 01:38 AM   #18
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Quote:
Originally Posted by xxPaulCPxx View Post
I didn't realize you were from Illinois, elsewhere in the country it can be simpler and cheaper:

For a gable fan:
$70 Fan
$12 25' 14-2 Romex
box, face, a couple clamps, and connectors
Some screws from the mounting kit
Drywall patch and compount where you put your foot between two joists... this is DIY, right? Oh wait, I still have to patch that hole in my own kitchen ceiling

Vs.

$250 fan
waterproof electrical grease
ladder high enough to get to your Gable vent and eave
Wasp spray... mattress to land on...
What do you need electrical grease for? I didn't realize we were talking gable fans... Still need the ladder, and now some siding to patch in and flash the hole. If you have a brick face all the way to the roof, then you now have masonry work.
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Old 05-07-2010, 01:51 AM   #19
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I correct myself on the grease, now I remember there was wire coming off the solar cell that was sealed, but the connection to the fan had those auto style spade connectors (I was thinking the connection was outside where it would need some protection).
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Old 05-07-2010, 03:58 PM   #20
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FWIW, unless one is in some extreme situation where nothing else works, I'd stay away from powered roof vents or the "whirybird" type. The latter can get noisy, allow rain in, and my research, however limited, is that they do little to extract any more air than a static vent.

My opinion is that ensuring correct soffit and ridge (either ridge strip or those inverted plate or box jobs) ventilation is the best way to go, and use the $$$$ one would spend on electricity or the fan itself to be better spent on additional insulation and/or air sealing the conditioned/unconditioned plane.

Those improvements have a one-time cost that pays back every month, with no maintenance or other replacement needed.

But that's just me. Others may disagree.
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Old 05-07-2010, 04:15 PM   #21
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I can thoroughly see the common sense of using a solar powered gable fan here, my "attic" gets very hot, and it will help move air that might not move quickly enough up my ridge/soffit vents. The brighter the sun, the faster it runs. Just makes good sense to me, so I will be adding one soon, before the attic area is less accessible.

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Old 05-07-2010, 05:27 PM   #22
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From the State of Florida: http://www.dca.state.fl.us/FBC/commi...CR-1496-05.pdf


"...Although attic ventilation has been shown to reduce attic air temperature and cooling loads the only examination of powered attic ventilators has shown the electricity consumption of the ventilator fans to be greater than the savings in air conditioner energy."

Now, one study in the above-referenced document showed a 460 KWh savings (cooling season) in a 1500 sqft home using a PV (solar) attic ventilator. Hmmm...Now, I pay about 8 cents per KWh hour here....so that'd be about $37 yearly saving. If the PV fan was $220, what's that a 6 year payback?

For those with higher electric costs, as they say, your mileage may vary. Of course, if the fan bit the dust at about year 5 or 6, well, there goes any savings.

The article does mention that the savings are not as high with well-insulated homes. This is just article of many I found, and I have not perused it in detail. I still believe one's money is better spent on insulating and sealing.

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Old 05-07-2010, 10:37 PM   #23
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My house had two gable vents and a whirly... never leaked, never squeaked in ten years I had the house. The attic didn't get extremely hot either, and the roof looks great 12 years later.
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Old 05-07-2010, 10:52 PM   #24
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A cupola is a great way to hide a whirly
Just need to make sure you can take the top off to replace the whirly if needed

I planned on having my cupola w/one side as a vent for the summer
But ended up with a bigger cupola then expected - 4' square
So I need to make a vent for the back

I figured passive venting would work, with a fan to cool it off in the middle of the night if needed

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Old 05-07-2010, 10:54 PM   #25
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Now all you need are Fran and Ollie! (or in this case, Fan....) thank you, thank you, I'll be here all week!
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Old 05-07-2010, 11:18 PM   #26
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My neighbors want me to put a bell in it
Then put a hunchback costume on & ring the bell Halloween nite while on the roof

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Old 06-25-2010, 01:25 PM   #27
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I have two electrical powered roof vents which I have now disconnected. I was told by a reputable roofing company they have been to 3 attic fires in the last two years (to repair the damage) caused by over heated bearings on these units. Apparently the electrical breaker never tripped and the seized bearings started fires. Also I have noticed all new house construction here in Saskatchewan does NOT have any "whirly bird" or power vents, only fixed units.

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