Hmmmm, sorry about that, let's try again ...
I'm planning on putting a fan in my bathroom which gets pretty steamy
after a few showers, especially now the air temperature is dropping. I
can't see much point in having it controlled from the light switch -
often when someone is showering it's daylight so the light is off, and
often when someone goes in there after dark they don't want a shower
and I don't want the fan to start whirring.
So (failing some direct link from the fan to the shower mixer)
humidistats seem the best solution. But from what I've read from the
archives they can be a pain because they can get triggered by changing
outside atmospherics. Because it seems that this is partly caused by
outside air blowing in through the fan I'm thinking of having the fan
controlled by an separate humidistat which I would mount on the wall
close to the shower area. This one would probably do the job:
I'm planning on getting a 6" fan because it's a pretty big bathroom
(5m x 2.5m x 2.3m). I was thinking of vent-axia's basic Silhouette
150X (no timer, no built-in humidistat).
I would connect this to be controlled by the external humidistat
(which has its own overrun timer to prevent cycling). I would also
like to add a 'three-way' switch which I could use to turn the thing
off completely when I never want it on, to set it to humidistat
control (which is where I would normally leave it) or to have it
permanently on (for situations when the humidistat was not telling it
to be on, but when I want it on anyway).
1. Does anyone have any idea where I could get a suitable switch
(ideally one which would serve to isolate the fan for servicing as
well, although if I had to have a separate FCU that would be OK).
2. How would I actually go about wiring this up?
Alternatively if anyone knows a ready-made fan with this level of
control which doesn't work off a switched live from the lighting I'd
love to know about it.