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Correct Way To Vent New Bathroom Extractor Fan?

Discussion in 'General DIY' started by oioi727, 2 Jan 2017.

  1. oioi727

    oioi727

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    Hi,

    I am looking to install a inline extractor fan and will involve a sparky to wire this up correctly. I would like to ensure the job is done correctly and no short cuts taken.

    Thinking of getting something like this:

    http://www.screwfix.com/p/100mm-mix...l+Content&utm_content=TextLink&utm_term=58258


    I have a attic above my bathroom:

    1) Should I vent out via the roof or sofit? I have read in a couple of places that the soft is a bad idea as it helps circulate the air? Softit's appear to be solid wood panels painted white on my roof.

    2) I have a old slate roof, can anyone recommend a flashing kit, if venting out to the roof is the correct way to go.

    Thank you in Advance.
     
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  3. Burnerman

    Burnerman

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    Personally I feel that the less interference to any roof the better so I'd go for the soffit......keep any vertical duct rise minimal and a slight continuous slope down to the soffit grille - which should be fixed so the louvres direct any steam away from the building.
    John :)
     
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  4. foxhole

    foxhole

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    I would use soffit.
    That's expensive, available under £50.
     
    Last edited: 3 Jan 2017
  5. oioi727

    oioi727

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    Thank you guys for the replies.

    Can I make the hole in the sofit from the attic or does it need to be done from outside?

    I assume it's best done from outside?

    Do I need any particular type of grill on the sofit as its going to be facing downwards?

    Also, should I get insulated ducting to avoid any condensation dripping back into the shower?

    Thanks

    Shaz
     
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  7. ^woody^

    ^woody^

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    Soffit is the least preferable option.

    More bends of the duct means less efficient extraction. Plus the position make back draughts and more back pressure when extracting more of a problem for the fan. Also harder to fit.

    A vertical duct and terminal is the most efficient and even gives some natural ventilation when the fan is not on - avoiding internal condensation build up. Its also much easier to run the duct.

    You can get generic lead slates for a terminal, or vent slates that can act as terminals.
     
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  8. oioi727

    oioi727

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    Thank you for the feedback woody, can provide me a link to something that you think would be suitable for me please.
     
  9. ^woody^

    ^woody^

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    Google for " lead slate " , " roof slate vent ", " roof fan vent " etc

    Here are some slate vents, but have a look as some are ventilators only and some can accept the duct from a fan www.roofingsuperstore.co.uk/search?keywords=slate+vent . There are also lead slates on that site, but the angle of your roof determines which type you need.

    That fan looks OK but I don't know about it for quality or life expectancy. Fit a rubber pad between any such fan and the structure to reduce any vibration noise.

    Presumably, someone will be fitting this for you? So cost may be a factor. The soffit option is not to be completely ruled out, but is IMO, it is the less preferable option if there is an alternative. So just have a think.
     
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  10. endecotp

    endecotp

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  11. DIYnot Local

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