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Old 01-25-2007, 06:33 AM  
harleysilo
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the threshold is adjusted properly....



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Old 01-25-2007, 03:53 PM  
glennjanie
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Got your attention didn't I, Harley? A space 24'x40'x8' is 7,680 cubic feet; to change that 10 times in 24 hours you have to move 76,800 cubic feet of air. That works out to 53 cubic feet per minute; does that sound a little better? The 3" pipe out means a 3" pipe in to me. If the pipe is run into your frunace retun; the air will be pumped upstairs by the furnace and then come back down to be removed. You could use sheet metal pipe if it is any cheaper but either kind should be insulated. Drawing winter air into the heated space will cause a lot of condensation.
Sorry I upset you.
Glenn



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Old 01-26-2007, 06:36 AM  
Square Eye
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I read in another post that you have a gas water heater.
I would be concerned that this thing will keep the water heater exhaust from drafting properly.

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Old 01-26-2007, 07:12 AM  
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of water heater?

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Old 01-26-2007, 11:53 AM  
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I don't anticipate any problem with the draft if you put the 3" make-up into the furnace return. It will just be one for one.
You said you don't have a return air duct; if the furnace is an up-draft, you could run the pipe directly into the bottom of the furnace. Your furnace fan is plenty strong to bring in more than the 53 cfm required. To do a quick test, see if the water heater draft hood will draw any smoke or a candle flame when it is heating. Same for the furnace; It might be a good idea to test when both are running.
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