If you have a reasonable size gable vent, there are fans made to fit up
against them. Or you can cut out the existing one and put in one that
comes with external shutters.
Have you considered a ridge vent, which is pretty easy to install,
effective and uses no power?
I did. I used a thermostatically controlled fan mounted in the north
gable vent. I profiled the vent, cut a triangle out of 3/4 plywood and
mounted the exhaust fan in that. My logic was; the south wind is
dominant so working with it seemed the proper thing to do, in the
winter the wind becomes northerly so having the vent partially blocked
again seemed prudent. I seems to work well, though it runs more than
I'd prefer. I also have a south gable vent an east facing dormer vent,
and ridge vent but no soffit vents as the design is open joist rather
than soffit and facial. I plan on converting it to soffit and fascia,
at which time I will drill the covers between the rafters and install
some sort of soffit vents
First let's make sure we are talking about the same thing. There are
fans designed to vent just the attic space and there are whole house fans,
usually mounted in the central hall way ceiling, that vent the whole house.
Assuming just the attic, I would suggest that 90% if the time you are
better off not having an powered fan. The included both electric and those
The make noise and vibration. In most cases they contribute very little
or nothing to cooling your home or protecting the roof. At best they tend
to cool the attic space somewhat, but that does not contribute much to the
living area assuming the attic is properly insulated.
If the area is properly ventilated using passive vents, that is the way
You really did not describe what kind of venting you have now, nor the
amount nor the reason you desire to change it. That information could be
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