we have a fan in the attic to vent out the heated air
that collects there in the summer. Saves on AC. Anyway
this fan is mounted in such a way that the motor noise is
transmitted to the wood of the house. When it is on the
top floor of the house has this very annoying hum. It need to
be remounted so the house doesn't become a big sounding
board. Does anybody know of an intelligent fix?
Before reinstalling with rubber pads or whatever somebody might suggest,
remove the fan and check it in the workshop for vibration, especially at the
angle in which it was mounted in the attic. Replace if necessary.
It might (or might not) be true that the cost of a fan and the energy to run
it is greater than the cost of running the AC a little more, but if it's
only break even, I would go with the fan so that the attic will not reach
130+ degrees and bake the stuff that I have up there.
The fact is, many homes do not have a "properly engineered passively vented
system". That's what we are talking about here. These home derive SUBSTANTIAL
benefit from fans, and it adds a great deal to the life of the building and the
roof. I agree that if you are putting on a new roof or building a new structure,
that incorporating passive ventilation is superior.
And would benefit even more by correcting the poor pasive system.
It is often possible to make large improvements to the passive system
without major changes. It is often necessary to make like changes for a
power system to work well.
I agree that passive is not the only answer and in some cases a power
system may be the best choice, but it should IMO be considered only after a
passive system has been ruled out and in those areas, such as the deep
south, where even a good passive system is marginal.
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