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Old 06-21-2009, 06:25 PM   #1
Mike K
 
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Replacing home made whole house fan blower


I built a whole house fan system using a old squirrel cage blower from the original 100000 btu furnace after replacing it with a 75000 carrier Infinity furnace. I'm guessing the old blower I used is around 1600 to 2000 cfm? I installed a 18" hart and cooley diffuser With 24" of 18" pipe above it. Then used 18" insulated flex duct to route the air to the blower mounted in a 16ga steel box.


After checking the amp draw on my old blower I see its pulling 6 amps and it's the wrong static pressure. I would like to replace the old blower with something like this.


http://www.atrendyhome.com/qcwhhofan...hannelid=FROOG



Since I have the grill and flex already installed all I need would be a fan and damper set up. Can anyone recommend where I could buy one? Or what specifications I should look for? My home living space is 1500 sq feet.

Thanks

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Old 06-21-2009, 06:53 PM   #2
GC/Master Plumber/Mech
 
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Replacing home made whole house fan blower


Replace thermostat with a recirc feature...Cheaper and more than likely more easy.

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Old 06-21-2009, 09:47 PM   #3
Mike K
 
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Replacing home made whole house fan blower


I think you misunderstood me. This blower pulls air from the ceiling of my living area and push's it into my attic during cool nights. But needs to have a closed damper when its off.
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Old 06-22-2009, 05:22 AM   #4
An old Tradesmen
 
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Replacing home made whole house fan blower


What do you mean by, "its the wrong static"?
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Old 06-22-2009, 11:21 PM   #5
Mike K
 
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Replacing home made whole house fan blower


The furnace blower is designed for a home duct system but Im not sure on the SP. I restricted the discharge to "make" it work but its not ideal. It was just free..

The Quiet Cool system has these specs..
Motor Voltage = 120V AC

Motor Amperage = 2.5 Amps

Power Consumption = 300 Watts

Motor Speed = 1560 RPM

Air Flow @ 0.1. SP = 2250 CFM
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Old 06-23-2009, 06:39 AM   #6
An old Tradesmen
 
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Replacing home made whole house fan blower


The dampers in teh pic of that link.
Will cause a higher static pressure then .1"

Probably, a 1/4HP blower motor is what your current set up needs.

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