"Doug Dotson" wrote in message ...
Try a different fan. I have several Hella fans they don;t seem
to create noise. Some of my older fans do create noise. Trying to
suppress the noise is probably more trouble than it is
worth.

Doug
s/v Callista

I use Guest fans onboard have six including one at the nav station and
one in the head, anyway no problems with RH noise. They seem to put
out the most air and are relatively quiet but at around $50 bucks each
they should be. Mine are wired and switched to the interior lights and
fans breaker. Radios, electronics etc all are on a different breakers
but really no special shielding or wiring.