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Not possible for extractor fan on bathroom - regs to confirm?

Discussion in 'Building' started by benjiman, 5 Jul 2021.

  1. benjiman

    benjiman

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    Hi,

    Have a 2m by 2m bathroom. Doesnt currently have extractor fan.

    Trying to install one, but looks from what I see that it wont be possible but wanted confirmation.

    The window has a 8" lintel. That leaves only about 130mm between lintel and the concrete floor above to make a hole for extractor.

    Nowhere else to put the extractor. What are regs for making extractor fan holes?
     

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  3. CBW

    CBW

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    Concrete floor above? Is this a flat? What’s in the timber frame, In the corner, a soil pipe? Any reason why you want an extractor fan? You have an openable window.
     
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  4. benjiman

    benjiman

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    Thanks for your reply.

    Yes its a flat and concrete floor above. Soil pipe in the corner.

    Yes there is openable window but thought during winter it would be nice to have an extractor and not have to open the window and lose heat.
     
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  5. pcaouolte

    pcaouolte

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    Does the heat know that it is supposed to stay in the room whilst the cold air is extracted?
     
  6. mikeey84

    mikeey84

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    Well the theory is that the displaced air is replaced with warm dry air from the rest of the flat/house, as long as the window is closed
     
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  7. CBW

    CBW

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    I still think you have options. Vent it into ceiling void and though the wall, unless you can remove the void? You can get window ones, but they’re ugly and involves removing the pane and fitting a new one with a hole in it.
     
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  8. bernardgreen

    bernardgreen

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  9. JohnD

    JohnD

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    So an extractor needing a 100mm hole would fit.
     
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  11. benjiman

    benjiman

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    Would it not be too close to the concrete ceiling slab?
     
  12. JohnD

    JohnD

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    there seems a useful space between the concrete floor above, and the false ceiling. If it is brick and block you can core-drill it. May be preferable to get a builder or plumber in to do it.

    you could cut out a section of the wooden frame while working.

    It is preferable to tilt the duct slightly so any condensation will run to the outside.
     
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  13. benjiman

    benjiman

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    Thanks..Ok I see what you mean..cutting out the section of wood section should give enough space to make the core hole.

    Its brick work outside as well as on the inside. I'll give it a go with a core drill and hopefully make it through!
    Cheers
     
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  14. JohnD

    JohnD

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    if the room has a shower, you can use a ducted fan, which can have greater air movement through a 100m duct than you can get with a wall fan.

    They can also be very quiet.

    I strongly favour one that comes on automatically with the light switch, and has a timed run-on. With a false ceiling and a duct, you can position the inlet grill directly above the shower.
     
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  15. benjiman

    benjiman

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    Yes it will have a shower. Great, good advise i will look at a ducted fan and have it come on with light.
     
  16. JohnD

    JohnD

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  17. CBW

    CBW

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    I think Envirovent are similar design, possibly a subsidiary, and great fan. Silent 100 cheap enough.
     
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