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gbwillson

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Reply with quote  #51 
I think Hermit may have asked, but is the dirty crawl space conditioned? It looks like it has insulation all around, is it tightly sealed like the rest of the basement?

Greg

Bert

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Reply with quote  #52 
It is insulated. Funny thing is that it was blocked off from the rest with fiberglass insulation. Stuffed into the opening between the crawlspaces.
There is one vent to the outside with a board over it, so it looks like they didn't know which way to do it.
It is pretty dusty in there and although there is plastic over most of the fiberglass insulation, there's some pieces scattered around.

The walls are insulated and the ceiling too. The cleaner crawlspace is not insulated.  Bare ceiling for heat to rise.

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Bert K.
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Garage_Hermit

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Reply with quote  #53 
Quote:
a strong stream of air across the family room and out a doorway


Then Bert could then become a NASA sub-contractor, and use his home for small-scale wind-tunnel testing for next-generation lifting bodies... [cool]

G_H

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gbwillson

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Reply with quote  #54 
Well, he is the one with the 3-speed, dual intake, turbocharged, afterburner fan. My collector fans are all exhaust fans from a kitchen. It's like a Yugo compared to a Porsche. I do have a BIG 6,500CFM fan. But with 22" diameter blades, it's simply too big...for almost everything![biggrin]


Greg





gbwillson

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Reply with quote  #55 
You could split off a duct leading part of the air into the family room and the other into the family room. A damper could control the flow to each area. How far is it from the South wall to the basement? If you are going to be having such a large intake, it sure would be nice to pull the cold air off the basement floor, even if the heated air doesn't return to the basement. As far as having the heated air enter into the either crawl space, I wouldn't do it as the space between the joists is insulated, which makes me guess the space isn't conditioned. And I sure wouldn't want to draw air into my collector from an unconditioned space, nor one so dirty. Depending on the fan used and the location, noise may not be an issue. The fan could be located in the basement or possibly the crawlspace which would keep the noise away from the living spaces.

Greg



Bert

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Reply with quote  #56 
Quote:
Originally Posted by Garage_Hermit
Quote:
a strong stream of air across the family room and out a doorway


Then Bert could then become a NASA sub-contractor, and use his home for small-scale wind-tunnel testing for next-generation lifting bodies... [cool]

G_H


LOL there's an idea!

Greg,
It's about 25 to 30 feet to the basement. With that fan it may be okay.


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Bert K.
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gbwillson

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Reply with quote  #57 
With 8" ducts, you should be fine, as they have nearly twice the capacity of 6".

28.28sq. in. versus 50.24sq. in.

Greg in MN
Bert

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Reply with quote  #58 
Looks like that will be the way to go then.
Only question is will it have to be a ZPDP since I still can't get a duct on the one end.
Do you think a DP would work with that fan and 8" ducts? Maybe with a big plenum at the turn around. 



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Bert K.
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gbwillson

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Reply with quote  #59 
Frankly, I don't know how a ZPDP would work at that size and velocity. You would be the first. The ZPDP won't exactly have a plenum, at least at the turn around. But that is the main point of restriction.Other than extra long duct runs, is there any reason you could't have both intake and exhaust to and from the basement? I mean, they are out of the wind and while the runs are quite long, you will be using 8" ducts and a strong fan. The restriction of the turn around may very well be as much of a problem as extra long ducts. Again, I would suggest building the first ZP and see just how much heat you be producing. The larger size of the East collector may offset any performance loss due to the extended runs. OR...consider a rooftop install. 

Greg in MN
Bert

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Reply with quote  #60 
Greg,

I want the intake and outtake to go into the basement. I just don't see how it's possible with them at opposite sides of the collector.
Here is what I'm up against;

BPLAN-red.jpg  The red space is the area where I can't get to, to install ductwork. It is also exactly where the family room sits above it.

If I don't use a double pass, then I would have to go through the family room wall for either the intake or out.

I'm reluctant to cut another hole in the family room and I think it would be too loud for the fan to be there for the input.
If it was the output, then the family room would get too warm.
I'm trying to send the hot air into the basement for more uniform heat and I believe it would be quieter.

Don't really want to put one on the roof. 

It's a tough one.




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Bert K.
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