I want to replace my bathroom extractor - looks quite old and is a
strange size (I think) the front cover is, 160mm x 160mm. I can't see a
make on it but it is one of the type that switches on and off with the
light and stays on a minute or so after switching it off.
I want to replace it as its noisy but with a pull switch type so it
doesn't come on with the light all the time.
Any ideas on replacement? I don't need to replace the outside wall
louvre as it looks and works ok.
further to last post, have taken the extractor off to look at it, it
says 5927 timer model on it.
Notice that it has 3 wires - 2 red and one black, if I was replacing it
with a switched type how many wires do they have - thought they had 2
wires? would it set any problems ?
The second live cable is for the timer. If you replace the fan with a
non-timer it will just need one live and one neutral, so just use one of the
live cables and make the other live cable safe. I had similar when replacing
a timer bathroom extractor fan with a non-timer. Bathroom extractor fans are
normally for a 15cm/6 inch duct/opening.
I was a bit quick in replying so I guess the L , N , SL
SL relates to Switched Live? so in that case the new extractor would
use the wire from N and the wire from SL and then isolate the L - does
this make sense?
Presumably, the SL is coming via light switch - so if you use that, the
extractor will only work when light is on. So unless you only want it to
come on if the light is also on, you'll need to use the other Live. Don't
cut either of them until you've tested it - in case they're wrongly
I'm not aware that the Live feed should also have a separate pull switch
(assuming your new extractor comes with a pull-cord switch built in) but
Codswallop may be more up to date than me.
And remember, if you dispense with the timer, the thing will often be
accidentally left on.
Any device like a fan or other motor is required to have a means of
disconnection for servicing. If this is a switch it must switch *all*
connections and have at least 3mm separation when open. Three pole
switches specifically made to fulfil this requirement for bathroom
fans are readily available.
That's interesting - thanks. When did this rule come in, and does it apply
everywhere or just wet rooms?
We're in a 40 year-old place, and will also want to swap a couple of
extractors (which have no separate isolating switch) before long. Will this
rule apply to such circumstances or just new-builds?
Everywhere, e.g. there should be isolation switches for
hoods/extractors in the kitchen, for boiler electrics, in fact just
about anything that's permanently wired as opposed to being plugged
in. I'm pretty sure the requirement has been in place for quite a few
editions of the IEE wiring regs., it's not a recent change.
Hmm, interesting question, I suspect that if you just change the fan
and use the existing wiring then it's allowable. However since the
IEE regs are not the law anyway it's questionable whether you have to
conform to them at all. On the other hand an isolation switch is a
big convenience when you want to clean the fan out etc.
There is it L , N , SL are marked on the present extractor so I guess I
just use one wire from L and one wire from N and isolate the SL wire is
The ducting is 4 inches so when I see 4 inch bathroom extractor (100mm)
in for example screwfix then this relates to the ducting then and not
to the actual size of the extractor then?
I have looked in the screwfix catalogue and they don't actually give
the front plate size, only rate. Unless I am reading it wrong.
The front plate size is vital because the old one overlaps the tiles,
just the way the installer did it I guess. I will take mine off and
just go down to b&q or a diy place with it to get a similar size, guess
they wont be more than a couple of quid difference between them and
Got all the info I need from this newsgroups - great and thanks.
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