Could this shower room have an extractor fan?

[palomino698]

Shower suite being replaced this week, small room 7' x 6'. Two walls will be fully tiled, dividing wall to bedroom is sealed asbestos (1920s semi), outside wall is double layer concrete between original oak beams, the window is double glazed aluminium. Ceiling is asbestos with some sort of polystyrene sheet stuck on, and embossed paper over (done by prev owners), with a central flush light fitting.

There is no ventilation other than opening the window and door, and with four of us showering each day it gets very wet. I'd love an extractor fan but can't see it's possible to fit one, unless anyone has a bright idea. To put one up through the loft with a flue to the outside would mean cutting a bigger hole in the ceiling but I don't think that's allowed now, and replacing the asbestos ceiling is just not an option - every upstairs room has them - and the d/g window, and the construction of the outside wall, presumably mean putting a hole in there isn't an option either (especially as the room will have its new suite, and be decorated, by Friday).

Is the only solution to leave the heated towel rail on all day, all year, to dry the room out? Or use a portable dehumidifier? Should have thought of this before planning the new suite... duh

 

[pbar]

An inline fan in the loft space might be best. You only need a 4" hole in the ceiling to take the vent, and there are various ways to achieve that. Is this not possible?
Also, you can have windows fans in double glazed units.
Also, what's above the door? Sometimes there is something like a false panel above doors, could a fan/vent not go there, with the ducting passing through to the other side, then up into the loft. Some boxing in would hide everything.
Once the ducting is up into the loft space, there are various options to get it outside. Either to a soffit, or into a vented roof tile, or an even easier option is to get a Lapvent, this enables you to extract up through the roof, but you fit it from the inside the loft with no disruption to the tiles.

 

[TicklyT]

It should be possible to poke a nice clean 4" hole in a concrete wall with a core drill.

Diamond tipped core drills are often available to hire

A substantial lump of concrete would probably just laugh at one of the cheap core drills you see for about a fiver or so on market stalls.

Your plumber may have the kit to do the job. They often need to put holes in walls for soil pipes etc.