Ventilating inner walled bathroom

[ShaneA]

For some reason our house was designed with the bathroom on a completely inside wall and has suffered damp issues because of this. When we moved in I took out the old failing extractor fan and replaced it with a 100mm inline model which has made alot of difference however at times it still can be like a sauna in there (more so when the other half gets cold so jacks the heat up) so I thought about running a second vent over the shower with a Y piece just before the fan (the current is the opposite side of a small room) or having a secondary fan running to the same roof vent.

I have tried to think of a way of getting some natural ventilation but short of a velux window with some sort of tube I cannot see any options?

Just wondering if anyone else has any other solutions before I start buying stuff.

Thanks

 

[foxhole]

I have inline 6inch fan connected via Y joint to twin vents above shower [no windows in room] works a treat, don't even get condensation on 6ft mirrored wall.
But how it's switched is also very important, internal room needs to have fan run whenever it's occupied so I switch with a ceiling mounted sensor, time switch, runs on for 5mins after exit,.