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Discuss Bathroom extractor fans? in the Bathrooms, Showers and Wetrooms area at

  1. macka09

    macka09 Plumber GSR

    Hi all. Im just wondering what fans you guys install on your bathroom installs and whether you get a sparky in? Whats the deal with the fans that go up into the loft? Do all of them have to go outside due to condensation? Advice apreciated guys.
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Vent axia

    And yes as bathrooms are notifiable unless you use an inline one

    And direct outside either via the wall or ducted through the soffit or roof
    • Like Like x 2
  3. YorkshireDave

    YorkshireDave Plumber Top Contributor!!

    100% agree with Shaun.

    Personally I gave NEVER fitted anything other than axial fans. No other moves enough air to do the job of clearing and reducing condensation. My rule of thumb is to test a fan with a sheet of A4 paper. If it doesn't 'grab' it there is not enough flow.

    Energy regs may advise a lesser flow, but mould growth and long term damage is a far far less price to pay.

    FWIW, mount the grill in the shower cubicle so air is drawn through it and helps dry it out. Leave a 10mm gap under the door and explain to customers that they must leave windows SHUT whilst the fan is on to encourage air to be drawn through the space. Air movement is often counter-intuitive.

    Lastly, I NEVER screw the fan down. Mine all sit on folded up insulation to dampen sound. Screwing down transmits noise - period. My method you just get 90% air noise only.
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Here's some tech for you,

    For a bathroom you want around 5-8 air changes per hour

    And around 60m3/h extraction
    • Like Like x 2
  5. YorkshireDave

    YorkshireDave Plumber Top Contributor!!

    Personally, I find that too little for long term effectiveness. Over time flow drops off as blades and ducting become dirty and resistance to flow doubles. By over speccing flow, you get an effective system between annual blade cleans (more like every 2 yrs realistically).

    The minimum regs requirement is far too little to be genuinely useful IMO.
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    :D I'm yet to meet a person / homeowner who cleans there fan
    • Funny Funny x 1
    • Winner Winner x 1
  7. Murdoch

    Murdoch Active Member

    Agree with most of the above , plus a lot of fans need a 3A fuse which adds complications to the install.

    I recommend people have high pressure fans and most of the fan / light combinations are rubbish.

    NB: the longer the run of the ducting, the less effective the fan becomes ..
    • Agree Agree x 1
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    How does a fcu add to the complexity of the instal ?
  9. macka09

    macka09 Plumber GSR

    Thanks for the advice guys. Is there any guidance solely relating to regulations we need to adhere to as plumbers?
  10. Murdoch

    Murdoch Active Member

    Part F of the building regs...
  11. Murdoch

    Murdoch Active Member

    Even adding a fan needs proper testing as you are changing the electrical installation, a certificate issued and in some cases part P notification competed.
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yes minor works cert etc
  13. S.P.S.

    S.P.S. GSR

    • Winner Winner x 1
  14. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    Kair heat recovery unit. Best fan for any bathroom . you can’t go wrong with this one. No chance of mound
  15. Gasmk1

    Gasmk1 GSR

    talking of bathroom fans i used to do some work for a guy who installed bathroom adaptations for manchester. they made him have agas safety inspection on all his jobs because the bathroom fan had been fitted. i think belts and braces form someone in the dept.
    • Funny Funny x 1
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