About 20 years ago I installed a tstat-controlled attic exhaust fan
suitable for a small-medium size attic.
Years later it caused tv/radio interference in the house, so I built
a frame for it and put it in a window in my detached 2-car garage
to improve air circ. in very hot weather.
Now it's making horrible, horrible sounds. I've oiled the motor
twice: doesn't help.
I once ran a box fan 'till the wheels came off. Got a nasty
looking spark when it shorted out.
What are the chances of the failing exhaust fan starting a fire
in my garage?
My roof fan failed and it just stopped working. My neighbors failed
and it set fire to his roof. This was about 1 am and if it were not
for our neighbor across the street coming home late and seeing the
flames, who knows. When I got new roof shingles, I put in passive
Mine failed and I unplugged it, but there is little chance of it
starting a fire as it is well away from any combustible material.
The wiring is another matter, so I will have my new one on a surge
protector with a circuit breaker.
It is exactly this risk of fire that the only active attic vent I
would consider is one of those little self-contained solar powered
units. That and the wired ones suck a lot of juice, possibly more than
you'd save on your A/C bill.
The motor should not be creating EMI. If was creating radio
interference typically because it was failing. Maybe something as
simple as worn brushes. Maybe arcing on a loose wire. Or maybe a hall
effective sensor was not properly positioned.
No one can say if it is a fire hazard. But EMI was a precursor to
Only person who can answer the OP's question with authority is one
who opens that fan or who obtains a detailed autopsy report of that
fan. Most would simply replace the defecive motor.
It might've been 8-10 years w/o EMI. Then about 10 yrs in the
garage after the EMI started.
Methinks you are correct, kind sir. I turned the fan off
I would if practical and cost-effective, as I need the garage air
circ. and the window frame unit is built and functional. If I were
able to find a bolt-up motor replacement at maybe Grainger, it'd
likely cost twice the price of a new exhaust fan from a bigbox
"Mit der Dummheit kaempfen Goetter selbst vergebens!"
Just out of curiosity, are you asking because you WANT to start a fire
in your garage. If so, keep it running until something happens, If
not, then a very, very small risk isn't work the possibility of it
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