geraldthehamster wrote:
Two small bathrooms, one above the other, in a dormer bungalow under
redevelopment. Both need extractor fans

You could combine ducts and then have one fan sucking from both
rooms.

You would need double-pole light switches in each room, one pole
switches the room light and the other pole switches the fan. This
stops the light in bathroom B coming on when someone switches on the
light in bathroom A.

This was discussed, and I drew a diagram, at
http://groups.google.com/group/uk.d-...cf3538d8d9 fb

Owain