wrote:

small bathroom fans are really hopeless anyway, and not even worth
switching on at bathtime.

Th real solution is to add a lock to the window that enables it to be
locked quarter to half an inch ajar, so no-one can see in but some
ventilation occurs.

Compared to a fan:
cheaper to buy
cheaper to install
no run cost
silent
much longer lived and more reliable
more pleasant in use.

In our experiance the window solution never really worked. The bathroom
has one permenant vent like the OPs, plus a large fanlight window that
is always open (although partially obscured by the window blind). If you
had a shower the condensation would still hang about for ages.

After switching to mains pressure hot water that made the situation even
worse and a fan became a requirement. The small 4" fan actually does far
better than I expected.


--
Cheers,

John.

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