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Shower ventilation fan.

  • 06-04-2024 7:27pm
    #1
    Registered Users, Registered Users 2 Posts: 1,236 ✭✭✭


    Is it possible to wire a timed shower ventilation fan in a way that it'll turn on when the shower is switched on on the shower unit - not when the shower pull switch is switched on?
    Thanks in advance.



Comments

  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    I wired my fan to activate when the shower comes on using a current sensing relay on the shower cable

    So yes it's possible. I'm a spark so that helps



  • Registered Users, Registered Users 2 Posts: 17,279 ✭✭✭✭Sleeper12


    It's against the wiring regulations to have anything else on an electric shower circuit. Absolutely nothing from the shower right back to the fuse box so I don't see any way to do it for an electric shower & be able to meet the regulations.

    The timed fan should be wired into the light switch & not the shower. The regulations for a power shower may be slightly different and a fan might be possible. You will need a REC to carry out this work regardless & they will be able to confirm what is allowed and what isn't before issuing you with a safety certificate



  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    It can be done with sensing relay as i posted

    Fan wiring can be totally independent of shower circuit

    Not aware of any reason why a fan should be linked to a light switch, even though it's commonly done



  • Registered Users, Registered Users 2 Posts: 432 ✭✭Roger the cabin boy


    Any link to the current sensors?



  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    I know my ensuite anyway I don't want the 10min overrun everytime i take a quick pee or having to turn on/off a fan which is why I used sensing relay method

    Fan is activated by electric shower

    Humidistat would do a similar job I suppose to what the op asked



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  • Registered Users, Registered Users 2 Posts: 6,915 ✭✭✭Alkers


    As above humidity controlled fan will only come on when the shower is on couple of mins



  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    How long do humistat fans take to activate on a low setting



  • Registered Users, Registered Users 2 Posts: 465 ✭✭Ted222


    It’s possible to have a double light switch with one switch used solely for the extractor fan and the other for the regular light.

    That way, it’s possible to use the bathroom in the middle of the night without the noise of the fan.



  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    Sure ya can turn it on and off

    The idea here was to automate it



  • Registered Users, Registered Users 2 Posts: 9,107 ✭✭✭micks_address


    It depends on how you have set it. I just had one installed and it's on its own switch. I found you can't rely on the humidity sensor to turn off the fan reliably. I bought this one

    Xpelair C4HTSR 4" Simply Silent Contour bathroom extractor fan with humidistat and timer, plus choice of square and round baffles, White, 240V

    https://amzn.eu/d/7Qd3rqL



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  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    Ya but I'd wonder about those fans ability to extract moist air

    The manrose I fitted has 10x that fans max flow rate

    The sensor relay and overrun is a great automated setup , ya never have to look at a switch or a humidistat setting after .



  • Registered Users, Registered Users 2 Posts: 9,107 ✭✭✭micks_address


    Do you have a window in the room? The fan I linked to has two speed settings and I've it at the lower.. much quieter and it works well. More extraction means a louder fan.. inline in the attic with ducting is probably the best way to go it you need maximum extraction



  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    No

    I fitted inline fan and rigid ducting in the attic to soffit

    Not preferable to roof ducting but works well



  • Registered Users, Registered Users 2 Posts: 134 ✭✭Back Home




  • Registered Users, Registered Users 2 Posts: 2,203 ✭✭✭drury..


    MF100T



  • Registered Users, Registered Users 2 Posts: 134 ✭✭Back Home




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