"Trevor Smith" wrote in message ...
I am fitting an 4" extractor fan in the bathroom wired from a junction box
on the lighting circuit so does it still need a double pole isolator
switch?.

If you have no external wall there you need one, but otherwise I
wouldnt bother. People often fit these in the hope it will clear
smells or damp, but really theyre fairly useless. A far more effective
alternative is a locking mechanism that allows the window to be locked
securely 1/2" open when wanted. 4" fans get noisy over time, waste
electricity, throw heat away, and are simply ineffective.


Regards, NT