Bathroom Extractor Fan

[derekpara]

I want to replace my existing extractor fan with one which has a delayed motor - if you know what I mean.

Is it a simply a matter of disconnecting the wiring, removing the old fan, and reconnecting to the new fan or is it more complicated ?

Thanks.

[Old_Geezer]

I'd expect so: surely any delay is built into the fan unit rather than outside of it. (Not that I have experience of them.) Should say on the box.

[TWR]

We had one fitted a long while back Dereck, seems there is an extra wire for the Delay, the delay from what the Sparki told us keeps the fan going for 3 / 4 mins longer.

[jomifl]

If the fan assembly has a switch off delay built in then the wiring will be the same. Make sure that you isolate the circuit before any work and check that it is isolated and that the wiring connections are not live with a multimeter as there is no guarantee that it was wired properly.

[jomifl]

as a last resort read the instructions

[TheChair]

^^LOL

[The Builder]

I guess you mean a "Timer" fan, Derek? A regular fan, but having an adjustable overrun.

Your fan probably has three wires (switched live/neutral/earth.) You'll need a fourth (permanent live.)

How easy it is to bring in the permanent live depends entirely on how your lighting circuit is set up.

Assuming your fan comes on with the light switch, the usual thing is to run a wire from the ceiling light back to the fan. Or, better still, remove the existing "twin & earth" cable and replace it with a "three core & earth"

[BRIGHT SPARK]

......and dont forget the fan isolator and the rcd protection......and if you upgrade from a 2 core cable to a 3 core and earth..dont forget the building control notification....:-)

[The Builder]

Yep, BS is right on the button, as always. I should have said that a new cable should run from source to fan VIA the isolator switch.

New cable, plus location of work (bathroom) makes it notifiable........ and must include RCD protection.

All in all, better to have a Part P registered electrician do this. All kosher then :o)

[derekpara]

Great answers from you all as usual. Many thanks.

As I've had a few shocks in the past I think I'll call a sparks !

D