I have a Manrose centrifugal fan mounted in the ceiling of my bathroom and
connected to a sweep bend and a3M x 100mm pipe and which terminates
externally (through a brick wall) in a white grill.
It's a bit noisy as the ceiling "drums" a little. I would like to reverse
the arrangement, i.e. Fan outside, grill inside
Does anyone know of a waterproof fan preferably a centrifugal type suitable
for connecting externally to the 100mm pipe and suitable for fixing to the
brick wall.

Tom

Tom wrote:
I have a Manrose centrifugal fan mounted in the ceiling of my bathroom and
connected to a sweep bend and a3M x 100mm pipe and which terminates
externally (through a brick wall) in a white grill.
It's a bit noisy as the ceiling "drums" a little. I would like to reverse
the arrangement, i.e. Fan outside, grill inside
Does anyone know of a waterproof fan preferably a centrifugal type suitable
for connecting externally to the 100mm pipe and suitable for fixing to the
brick wall.

Tom

Don't know about that, but you can certainly get duct fans that go in
the middle of the duct. So you would have grill inside, grill outside
and then an inline fan somewhere along the 3m of ducting.