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big exhaust fan with shroud encased in housing creates vacuum to exhaust heat

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big exhaust fan with shroud encased in housing creates vacuum to exhaust heat bent 03-02-2007
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Posted by bent on March 3, 2007, 2:10 pm
http://www.eere.energy.gov/buildings/info/homes/wholehousefan.html

this is what I were planning on planning; now where to get the fan?

> any pointers?



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Posted by bent on March 3, 2007, 2:33 pm
I've got to ask a question now a see a snag.

under the lightly bolded heading

Use "H" Brackets To Provide Proper Support

at the same site above
http://www.eere.energy.gov/buildings/info/homes/wholehousefan.html

The site says to put the fan above the truss, but I probably only have room
to put it below since it is at the edge of the sloping roof.
And my truss is in the middle of the the 34" wide hallwall (ceiling at the
top of the stairs), so its above or below.

I can see putting the fan at the roof level, and anything closer to the
house may not vacuum air out, but pull attic air in. Anybody see a problem
mounting the 6-1/2" housing sticking a couple inches into the ceiling form
above, rather than mounted above the truss? If its the same side walls,
does it theoretically matter?



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Posted by bent on March 3, 2007, 3:36 pm
http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?CNTTYPE=PROD_META&CNTKEY=misc/searchResults.jsp&N=2984+3734&cm_mmc=hd_over-_-Search-_-D-27X-_-bid20546567-whole_house_fans&ysmwa=KCQtJ0ec2N-WrZDlZVYLz8WDFj8O3fNsFV-4NYa_dlbky9HyDPyF4TVEdLCMF31-
is perfect.

Why does "Whole House Fan" yield only Zinnser and humidifier at
homedepot.ca? Actually thats what anything yields.



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Posted by Steve Barker on March 3, 2007, 8:24 pm
You need 10 sq ft of exhaust for a 30" fan. Do you have vented eaves? Or
add up the total area of your attic vents. Chances are, you'll need more
for the fan to reach it's full capacity.

--
Steve Barker




> Like wholehousefan.com; ah, thank you, Before you go too far, do you think
> I'd need extra exhaust vents on the roof. Its on a recent top floor
> addition not original to the house. I am unlikely to patch the hole in
> the drywall now, but am equally unlikely to solve the answer to this
> question myself, but I don't know if this could be a(nother) disaster.
>
>>
>> "whole house fan"
>> T
>>
>>
>
>
>
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Posted by bent on March 4, 2007, 12:02 pm
Yes I just counted 2 screened roof vents, but exactly 1/3 of the soffit
panel area is of the perforated type too, so theres lots of venting, weather
it flows or not is another story.

Looks like I'll definitely be doing this, when I find a homedepot.com
version of the fan/shroud/shutters up here.

But I am really perplexed for the design b/c my inside ceiling, the attic
volume, the vented soffit, the roof, and where I'll mount some sort of
casing are all within an arms reach. I don't want to do it all and find out
it doesn't do anything.

There are 2 bedrooms on this top floor, and at hotter times you can feel the
heat rise as you go up step by step. Round off a full degree per step when
its hot!! I have big windows in both rooms on either side of the hallway.
[Even] if just this upper floor gets cooled (fully flushed by cooler outdoor
air) I'll be happy. But I don't know what to think.


> You need 10 sq ft of exhaust for a 30" fan. Do you have vented eaves? Or
> add up the total area of your attic vents. Chances are, you'll need more
> for the fan to reach it's full capacity.



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