Can't find the Xpelair version I had installed in a previous house about 20 years ago.
I want to have a combined humidistat/timer not built into the fan, so I can have ducting with a fan part way along and just grilles in the bathroom ceiling.
Humidistats can be a mixed blessing. They can bring the fan on when it's humid weather.
I think what I would try instead is a pipe stat on the hot water feed to the bath/shower, set to switch-on when the pipe gets hot. You get an automatic run-on timer, which is the length of time the pipe takes to cool down. One possible failure here would be if you run a hot bath and then spend ages in it (after the pipe will have cooled down), but I only do this if I have a cold, and I specifically don't want the high humidity cleared in this case.
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