Doesn't the fan suck out? Seems smarter than blowing combustion air into all the nooks and crannys of the trailer. Better to draw fresh air from all around and vacuum up the combustion air. That's how all residential fans work and for very good reason.
Some fans have a third signal wire to let the computer know the rpm or if it is jammed. Yellow I think and not need in this case.
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Threaded Mode
