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Tiling is a bit of a pain, you might have to try and cut the tile out so the wiring can go behind and while it's out cut a large enough hole for the fan. You'll need to check the proximity to the sink and consider the ip rating.
Core drilling kind of depends on which floor you're on. You probably need to drill a 6in hole using a core drill for a recessed fan, if you are 2 stories above a pavement you'll want to make sure you don't injure anyone! You can hire a core drill for a day, check there's no pipes in the wall and drill it in minutes to hours depending on what the wall is made of. Then you need a power supply with line, neutral, earth and a switch line so that it comes on when you switch the light on and carries on for a time after the room is vacant regardless of whether the light is still on.
I use the Airflow Icon stuff, it's expensive but looks smart and there are lots of optional modules you can fit depending on how you want it to operate. It also stops wind blowing back through the fan, you can fit a one way grill on the outside which would achieve this though. You should check based on the volume of the bathroom how much displacement you need but something like the Airflow 30 should cover it.
The wiring will need to be done by an registered electrician, or signed off by one. The bathroom is a 'Special' area.
You will get some traffic noise through the fan, it's not going to give you the same level of acoustic insulation as a brick wall. You might like to keep using the window and some bleach spray.
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Airhead
@Chalfie
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Small shelf thing in ceiling, there are small patches of black mould. I attack them when I see them with mould spray. I think ideally I would get the ceiling redone, fungicide/biocide the fuck out of it. Paint.
BUT.
A small fan pulling the moisture out would be good. The window is always on the cracked open position, apart from at night (because road traffic noise).
BUT WHAT SIZE. and how much to pay someone to install.