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Extraction fan in a bathroom

Former Community Member
Former Community Member
I have limited areas my fan can go. It is going to have be wall mount at the other end of my bath/shower head. My consumer unit is 30mA RCD protected. 


I have found a fan 

MONSOON ZONE 1 SILENCE TIMED EXTRACTOR FAN MON-S100T




it is main powered, I can’t do a 12v as there is No where the transformer can go.


is the monsoon okay to use? It says zone 1? 


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    it would depend if the room has a window or not, if it has not , then it would need its own means of isolation as per the building regs




    I presume you mean ventilation, but that is not the case.


    As per Chris' quote, that is all that The Building Regulations Part F states.
    "There shall be adequate means of ventilation provided for people in the building"


    Do people think that if someone does not want a fan in the bathroom, it is illegal?


    As with Part P, people make up all sorts of things which quickly become gospel with no foundation whatsoever.


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    if building control are actually going to be that anal (it does happen). Given that it's your own house and you know the use case... it may be possible to supply both permanent and switched lives at the light fixture without rewiring too much. Quinetic switches are an option. Link out existing sw and cover with a quinetic switch (they do MK grid modules that look more like a traditional switch if you're not keen on the 'paddle' design, although i like them) , hide a receiver in or above the fitting, and bob's your uncle.


    Edit: not sponsored by quinetic at all... but of all wireless switches i've found them the most user friendly, no batteries and they don't lose their memory after power cuts (of reasonable duration, if your power's off for months, you may need to re-pair them)
  • 0
    no  I mean window, in section 5 of building regs for electricians, due to maintainability.
  • 0
    geoffsd:





    Do people think that if someone does not want a fan in the bathroom, it is illegal?


    As with Part P, people make up all sorts of things which quickly become gospel with no foundation whatsoever.




    Not at all, you do not need a fan, but if you choose to have one you have to comply with certain regulations.


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    In my bathroom, which has no openable windows, the fan (installed before my time) is switched with the light switch. When I finish a shower/bath, I just leave the light on. The next time I pop in for pee/whatever, I turn the light off if all the steam and condensation has dispersed. It's not exactly rocket science.
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    wallywombat:

    In my bathroom, which has no openable windows, the fan (installed before my time) is switched with the light switch. When I finish a shower/bath, I just leave the light on. The next time I pop in for pee/whatever, I turn the light off if all the steam and condensation has dispersed. It's not exactly rocket science.


    well if it was before your time it was either before the building regs, or some one said to hell with the regs it works so must be correct,  I was quoting the book building regs for electricians is all. we used to wire light without cps before my day and the lights worked. does not make it correct now with the

    18th edition  BS 7671 :2018. regs change and as professionals its our responsibility to adhere to them best we can


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    We are not talking about The Wiring Regulations.


    Please quote or indicate which of The Building Regulations mandate the fitting of  a fan in a bathroom - and/or mandate that it must work in a certain way and/or for a specific time after the light is switched off.



    What about the old wives' tale that the fan must have an isolator so that we can, where there is no window, repair it with the light on?


  • 0
    geoffsd:

    We are not talking about The Wiring Regulations.


    Please quote or indicate which of The Building Regulations mandate the fitting of  a fan in a bathroom - and/or mandate that it must work in a certain way and/or for a specific time after the light is switched off.



    What about the old wives' tale that the fan must have an isolator so that we can, where there is no window, repair it with the light on?


     


    I believe the BS 7671:2018 may have a relevance, under regulation 115.1.

    As for the regulation about fans and operation there is no regulation regarding this but I am sure you knew this, But if you choose to install one, a electrician should install it as per the regs. and then 134.1.1 would come into play don't you think.  And shame on you saying the IET prints wives tales, I am sure that would come in to maintainability?132.15.201 perhaps. if the light is off some one may assume all lives are isolated. and I am sure no skilled person would install a fixed appliance with out having local isolation


  • 0
    [q]I believe the BS 7671:2018 may have a relevance, under regulation 115.1.[/q]
    Yes, but how is that related to the claimed Building Regulations regarding fans?


    [q]As for the regulation about fans and operation there is no regulation regarding this but I am sure you knew this,[/q]
    So why are people stating that Building Regulations say this or that when they do not?


    [q]But if you choose to install one, a electrician should install it as per the regs. and then 134.1.1 would come into play don't you think.[/q]
    Yes, The Wiring Regulations. There are no Building Regulations stating what has been claimed.


    [q] And shame on you saying the IET prints wives tales,[/q]
    Oh dear. Where do the Wiring Regulations state what I called an old wives' tale?


    [q] I am sure that would come in to maintainability? 132.15.201 perhaps.[/q]
    The MCB covers that.


    [q] if the light is off some one may assume all lives are isolated. and I am sure no skilled person would install a fixed appliance with out having local isolation[/q]
    The Wiring Regulations do not require local isolation for any appliance.

    However, the question remains that people have claimed The Building Regulations state requirements for fans and their operation.

    They do not.
  • 0
    geoffsd:

    However, the question remains that people have claimed The Building Regulations state requirements for fans and their operation.

    They do not


    I totally agree with your last point.  no they do not.  

    But if you choose to install one  134.1.1. states you will take into account manufacturers instructions. and I have not found one yet that does not need a 3 amp in line fuse so ,MCB won't cover it, and either a double pole or triple pole isolation.  so if fan goes in then you need isolation, But you don't have to put fan in.


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