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Inline Extractor Fan Wiring

Discussion in 'Electrics UK' started by funinacup, 5 Apr 2020.

  1. funinacup

    funinacup

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    Hey all,

    Looking at installing an inline extractor for the bathroom in the loft above as got plenty of access up there. Couple of questions:

    1. There's an old aluminium flu up there from an old boiler, it goes directly up and out the top of the roof. Would I be OK connecting the extractor to that?

    2. I'd like to use the fan with a humidistat, but would it be possible to have a switch or pullcord to manually turn the fan on if required?

    3. When taking a feed from the lighting circuit in the loft, should I run that to a switched fcu then into the fan?

    Thanks a lot,
    Michael

    IMG_20200403_145837_1.jpg
     
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  3. EFLImpudence

    EFLImpudence

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    I suppose I should say if suitable which isn't much help but it is just a hole after all.
    Is it a flexible gas flue?

    Humidistats aren't particularly effective in Britain.

    Of course.

    You don't really need an FCU.
    The wiring will presumably have to go via the switch and humidistat in one way or another.
     
  4. funinacup

    funinacup

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  5. EFLImpudence

    EFLImpudence

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    Yes, pipe looks fine. You might need a condensate trap to stop any running back into fan and/or some insulation around the pipe.

    Humid isn't only visible vapour. It's up to you.

    FCU also up to you.
    If you want the fan to come on with the light then you will need a three-pole isolator.
     
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  7. funinacup

    funinacup

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    Think we will give it a go with a pullcord only and see how we get on. Don't want it to come on with the light as we never need the light on in the bathroom in daylight hours.

    Might be able to tie the condensate trap into the boiler condensate too!
     
  8. winston1

    winston1

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    FCUs are not used* or required on lighting circuits.

    * They are sometimes used but only by people who don't know better.
     
  9. Taylortwocities

    Taylortwocities

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    Yawn

    FCUs are permitted to be used on lighting circuits. BS7671 (the WIRING REGULATIONS) specifically state that they can be.

    If they are required or not is a matter for a competent installer to consider.
     
  10. EFLImpudence

    EFLImpudence

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    What was the point of this post?

    You wrote something and included a note to say it wasn't true.
     
  11. DIYnot Local

    DIYnot Local

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