what are the regs for extractor fans?

Prob best to repost in the 'electricians' forum so relevant folks will see your post.

There are different 'zones' in bathrooms where mains or low voltage fans can be/cant be fitted. You need to know this before making assumptions. Plenty of good electricians on here to advise you.

 

Well the air it is extracting must actually exit the building. That would be first and foremost reg...