> The fan motor must have a permanent
> magnet field,
> because reversing the polarity of the input changed the direction of
> rotation.
AFAIK all of them do. Certainly all of the aftermarket ones, as that's how
they reverse when mounted as a pusher.
Interestingly enough, the DeRale fan I bought also said to remove and
reverse the fan blades when mounting as a pusher. Doesn't change airflow
direction of course, but the blades are more efficient one way than the
other.
Randall
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