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Is this in any way possible?!?

Discussion in 'Electrics UK' started by WabbitPoo, 5 Oct 2021.

  1. WabbitPoo

    WabbitPoo

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    SWMBO wants the shower room fan to come on by means of a pull switch, but to go off again after a set time (maybe 15 mins) if you forget to do it manually after showering. Then, the next person comes along and wishes to switch on the fan does so as normal (in other words the switch has reverted to off automatically).

    If my description males any sense,, is it possible?!
     
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  3. EFLImpudence

    EFLImpudence

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    Yes - just a normal timer fan set to required time (there will be a maximum time) and a 'momentary/retractive' switch.
     
  4. WabbitPoo

    WabbitPoo

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    I've never heard of a momentary/retractive switch - off to search for one....thanks

    so how would one be wired up to a fan, please?
     
    Last edited: 5 Oct 2021
  5. EFLImpudence

    EFLImpudence

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  6. 333rocky333

    333rocky333

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  7. rich8000uk

    rich8000uk

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    It would normally be run with the lighting circuit.
     
  8. EFLImpudence

    EFLImpudence

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    Last edited: 5 Oct 2021
  9. WabbitPoo

    WabbitPoo

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    Thanks guys. so the fact that the fan will run on for some time is down to the fact that it has an internal run-on time built in (I presume they can be adjusted?)

    I think I get it now. Thank you all for your help
     
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  11. EFLImpudence

    EFLImpudence

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    Yes, integral timer.

    Yes you can adjust it up to its maximum - 30 minutes usually, I think.
     
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  12. WabbitPoo

    WabbitPoo

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    Would another (better?) Way to do it be to have a fan with a humidisat built into it, and have the green switched on all the time? That way as soon as someone stats a shower the fan will kick in and once the room is cleared enough it will just stop
     
  13. RandomGrinch

    RandomGrinch

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  14. JohnD

    JohnD

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    I don't find humidstat fans much good.

    If you walk into the bathroom to have a shower or use the WC, why wouldn't you want the fan to start at once?
     
  15. RandomGrinch

    RandomGrinch

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    I always start my humidistat fan with the lightswitch for showers etc.
    One of the benefit of the humidistat is when the humidity is generated elsewhere in the house, the fan then comes on and adds that bit of extra background ventilation.
    I also use a delay on timer. When using the WC in the middle of the night, it is best not to wake up the neighbours!
     
  16. JohnW2

    JohnW2

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    Quite. If condensation on cold/coldish surfaces is the problem being addressed, then by the time the humidity has risen high enough to trigger a humidistat, it will be too late to stop at least some of the condensation occurring.

    Kind Regards, John
     
  17. JohnD

    JohnD

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    Do you need help in finding a modern good quality extractor with a ball-bearing motor and rubber mounts?
     
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