On Tue, 20 Jun 2006 16:39:19 +0100, Fatboise
wrote:


Look at Vent-Axia web site.
They have their "system calculator" document which gives info on duct
and
fan sizes etc.
One thing to be aware of is the huge reduction in performance you will
get
using concertina-type hose rather than smooth duct.
It may be far easier to route, but, size for size, it adds far more
resistance to air flow.

Phil


Phil,
Thanks for the advice about the ducting. I had a look at the
Vent-Axia website and it's just what I'm looking for don't know why I
didn't find this when googling???
Also remember if you want quiet operation choose a larger fan and run
it slower.

Robert
Robert