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Old 08-24-2019, 09:58 AM   #1
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Default Plumb needs help on sizing whole house fan/ venting

New build for son . I plumber 50 yrs. Industrial. 785sq ft ranch on crawl. roof has 12 ft ridge vent. Spec says vented sofetts-looks like 112' linear .
Builder installed home depot cheap 200$ whole house fan (kid smokes.) Sounds like helicopter-wife left house when he turned on. "he can turn it on to let het out then shut down" builder says trying to sell install-
I found a quiet cool fan for 450 dollars with no sound (43 dba) I want instead of his cheapo oversized 3000 plus cfm fan.
Issue now is venting.For a whole house fan, I need 2.5 cfm per sq ft as per recommended( 3.0 is better )780sq ft x 2.5cfm= 1950 cfm ---so the quiet cool 2250 cfm is the plan if possible.
My ridge vent is 18sq nfa inches per foot or 216 sq inches (12 ft long). soffet vent is ventilated dont know what brand he will use there but 125 linear ft.

will this whole house fan even work absent holes cut in roof for vents to accomadate the 2250 quiet fan altrnative to his loud oversized cheapo?
thought i read 1/2 ridge vent 1/2 sofitt vent somewhere bet vent design
advise best way to go. paid 950$ for cheapo installed and would like to save whole house fan since he smokes -if possible.
Don't want positive pressure due to inadequate vents in attic, hate to cute holes in roof-(just me) Motown
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Old 08-24-2019, 05:54 PM   #2
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Default Not in the attic

Don't vent into the attic, if you get snow it has to go outside. The humidity builds up and makes ice. As far as I know it will rot things very quickly.

Next problem is where it comes into the house from. You take it out and it has to come back in. If you have a chimney and the fan is running, it can kill you with Carbon monoxide.

Your numbers show a complete air change in three hours, if you bring in as much as you take out. If you rely on infiltration and the chimney a quarter of that.

Get yourself a heat recovery ventilator. It would recover fifty to sixty percent of the heat you'd be dumping into the outdoors. They can be installed and connected to existing furnace ducts.
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Old 08-25-2019, 01:46 AM   #3
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Old 08-25-2019, 09:22 AM   #4
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You need an air exchanger. An Hvac contractor will be able to size it properly.
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Old 08-25-2019, 10:28 AM   #5
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Perfect! I just read up on HEV. Looks like I need to put one in instead of what the carpenter builder came up with ( whole house fan) . I knew if I went to the plumb community I'd get correct plumber way to do this. I am building for a mental ill schizo 40 yr old son disabled. I decided to cash in my 401k, and build him a small house . My dream was him attending Michigan, or become 4th generation plumb. He is fine on his meds, although drinking and such are what they all do . Anyway, thanks all for the advice, and thanks for quick response. Motown
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Old 08-25-2019, 07:04 PM   #6
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Quote:
Originally Posted by Tango View Post
You need an air exchanger. An Hvac contractor will be able to size it properly.
Every new house here has one and most recuperate hot air before going out. Buy a good one because the cheap ones are just fans that drag in fresh air and throws out and wastes all the heated air.

This is just a random example.

https://www.rona.ca/en/ev05-700-air-...iABEgJYh_D_BwE

Last edited by Tango; 08-25-2019 at 07:06 PM..
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