Replacing a 12v bathroom extract fan

[littlespark]

The situation is, customer has a rather old wall mounted 12v extrtactor fan, with pullcord, humidistat and timer. Make is Johnson & Stanley "Dryflow"
Its wired through a transformer with PL, SL and N at the fan... Transformer is in the attic.
The problem is the fan runs constantly. I think the humidistat has gone on the blink. Customer has been using the 3 pole isolator switch to turn it on and off manually, but as its above the door, and she is quite short... she's been hitting the switch with a hairbrush and has broken the switch!

The customer has asked me to replace with a fan that just has a pullcord... no timer, no humidistat. (backdraft shutter if possible)

Can any 12v fan work with any make of transformer?

And if so, where can i buy one that doesn't come with a transformer?
Amazon is coming up blank and my usual wholesalers are too expensive.


Further info.
The bathroom has been remodelled since the fan was installed, and I think now it would be outside the relevant zone to be 12v, so there may be an option to fit a 230v IF the cable to the fan is 230v rated and i can get to the transformer and bypass it.

 

[westward10]

There is no zone which requires a 12v fan

 

[littlespark]

OK, requires an SELV fan.

Its mounted on the wall. When there was a bath there, it could be touched very easily by someone sitting in the bath.
There is now the hand wash basin at the fan.... then a wall about 1m away and a shower cubicle behind the wall.

The main question is, will connecting a fan to a transformer of another manufacturer cause in problems.

 

[westward10]

Zone 1 fans do not have to be 12v or selv. The fact someone can touch it is not relevant, the fan must be suitable for its location and a few manufacturers produce 230v fans for zone 1 installation.

 

[littlespark]

Nevermind the zones @westward10 , its an existing 12v fan, and ive been asked to replace it.
Can I use the existing transformer and just change the fan, or should I replace the tranny and the fan.

 

[westward10]

I would suggest yes as most 12v fans would have a similar current loading but it would be prudent to check the existing transformer is adequate.

 

[Taylortwocities]

Given the age of the fan and its transformer, and also the probable fact that the humidity sensor is knackered I suggest you replace both.
Remote Transformer + Pull Cord Switch
4 Inch Low Voltage Extractor Fan - Wall / Ceiling

Other suppliers are available and may sponsor this site...

 

[Spoon]

As above, just check to see what output the transformer gives..