the_constructor wrote:
Just out of curiosity, are 12V timer fans noisier than 240V fans....?
[...]
The fan is from Screwfix....

I have one of each type at home in the two bathrooms, both cheapo
Screwfix in-line ones mounted on rafters or joists. If anything, I'd
say the 240V one was a bit noisier; may be down to less effective
mounting (the 12V one's definitely mounted on rubber pads but I can't
remember how I did the 240V one!)

David