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Old 02-25-2011, 01:14 PM   #16
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Size of whole house fan needed


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Originally Posted by High Gear View Post
One of the problems with a whole house fan is many times the amount of

ventilation needed to run properly is more than you should normally have.

If you don't have enough venting then the air velocity can cause your vent

screens to plug with insulation.

Ron's method I believe is to duct it from the ceiling to the gable , I've not

seen it done this way but it makes perfect sense.
You can duct it, but I never saw the need. Plus being unducted, it clears the attic of heat.
And as High Gear said, attic ventilation is inadequate for the fan. As a matter of years of observation in many, many attics, they are not adequately vented for a static elimination of hot air, much less a dynamic source pushing 1600+ cfm's a minute. You end up pushing that air back into the house. You'll feel the air coming through the outlet and switch boxes.
So unless you've set the house's venting to accomodate the new load, it will be like the fan is undersized and won't work properly.
Ron

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Old 02-25-2011, 01:56 PM   #17
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Size of whole house fan needed


A few years ago we bought a whole house fan, I think it is a Tamarack, we bought it as a closeout at home depot (first clue). It has the twin 12" direct drive fans (second clue) and a insulated door that opens and shuts. It does not work well. It does not move enough air for our 1200ft home. The attic has 2 12" whirly turbin vents, and 2 large (15x30) gable vents, so venting isn't the problem. Biggest problem is the noise. It is SO LOUD (Think B-17). It is mounted in the hallway, and we can't watch TV in the living room, and can't leave it on after anyone goes to bed. So it doesn't get used which is a real shame. Where we live the evening temperature is almost always cool, but because of where our house is and the way it is positioned, we get ZERO natural airflow through windows and doors. I am this spring going to move it into the attic and try ducting it to see if it quiets and improves flow. I may just have to try something else.
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Old 02-25-2011, 02:15 PM   #18
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Size of whole house fan needed


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Originally Posted by FixitDragon View Post
A few years ago we bought a whole house fan, I think it is a Tamarack, we bought it as a closeout at home depot (first clue). It has the twin 12" direct drive fans (second clue) and a insulated door that opens and shuts. It does not work well. It does not move enough air for our 1200ft home. The attic has 2 12" whirly turbin vents, and 2 large (15x30) gable vents, so venting isn't the problem. Biggest problem is the noise. It is SO LOUD (Think B-17). It is mounted in the hallway, and we can't watch TV in the living room, and can't leave it on after anyone goes to bed. So it doesn't get used which is a real shame. Where we live the evening temperature is almost always cool, but because of where our house is and the way it is positioned, we get ZERO natural airflow through windows and doors. I am this spring going to move it into the attic and try ducting it to see if it quiets and improves flow. I may just have to try something else.
They have gable mounted fans that move up to 9000 cfm's. Ventamatic is one company that sells them. You leave a shutter in the ceiling and mount the fan in an attic wall. You can put rubber dampeners against the studs to minimize vibration and resonance.
Ron
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Old 02-25-2011, 07:28 PM   #19
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Size of whole house fan needed


Out of curiosity Ron , are you relying on the suction from the fan to open the

ceiling vent or are you using a shutter motor.

Being that your drawing from all the vents I think you would have to use a

shutter motor.
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Old 02-25-2011, 10:31 PM   #20
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Size of whole house fan needed


Quote:
Originally Posted by High Gear View Post
Out of curiosity Ron , are you relying on the suction from the fan to open the

ceiling vent or are you using a shutter motor.

Being that your drawing from all the vents I think you would have to use a

shutter motor.
I've never needed a shutter fan motor. These fans have an incredible pull to them and all houses are under vented. The shutters pop open before the fan reachs full power.
The same is true if you mount the fan in the ceiling and put a shutter on the gable wall. It blows open in a heartbeat.
Ron
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Old 02-25-2011, 11:29 PM   #21
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Size of whole house fan needed


I installed this fan yrs ago in a previous home and can attest to there draw.

Brick gables with small vents and a shallow attic steered me to a ridge vent

and deflectors because of cellulose dust and the velocity in the small space.

Mounting on a gable would certainly cut the noise level vs ceiling mount,....interesting .

Thanks for the info , don't know if I'll put one in here yet but I like your

method.



http://www.grainger.com/Grainger/DAY...RT2?Pid=search

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