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Whole house heater and dust generator?

Posted by JT on August 6th, 1998 03:25 PM
In reply to Whole-house fan also blows inside by TomR on August 6th, 1998 12:56 AM [Go to top of thread]

Tom, you hit the nail on the head, and BTW, thanks
for a great description of what I have warned against
in several posts.
Venting for other purposes aside, you need a minimum
of 1 sq. ft. of free vent area (screens and
louvers cut down free area) per 1000 CFM of air to
be moved. This assumes that the fan can generate about
0.1 inch of water of static pressure. Even at this
level of vent area there will be significant pressure
in the attic so more is better. You will always have
some pressuriaztion, you just want to get it
down to reasonable levels. Once you do, the fan will
quiet down and the house will be cooler.

As a parting note, you have just had a graphic
demonstration of all the air connections between an
average attic and the house and basement. Realize
that next winter, the process will reverse, and the
air which you have paid to heat will begin leaving
via those connections, along with any moisture from
the basement. Depending on where you live, that
translates that to high heating costs, ice dams, etc.
You might want to browse around at,
once you set your fan to rights.

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