Oh really? They are more noisy quite often. I'm sure I've seen ordinary fans
with longer ducts, but most were straight.
Brian

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The Sofa of Brian Gaff...

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On Monday, 4 November 2019 23:04:46 UTC, wrote:
The never-ending list of jobs has now reached the point of needing an
extractor fan for the new loo. The requirements are straightforward:
effective, wall-mounted, quiet, no timer.

How long duct? Over a couple of metres you need a centrifugal fan.

Owain