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Extractor Fan - How to fix ducting to a wall

Discussion in 'Electrics UK' started by BigBev, 7 Oct 2011.

  1. BigBev

    BigBev

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    Hello :D All

    It's my 1st post on this forum but in the past I have read many useful tips here so I hope someone can offer some advice.

    I have a new downstairs loo which is vented into the garage. Obviously, need to vent it to the outside so we're looking to fix some flexible ducting from the cloakroom end of the garage to the outside wall. My question is, how should we fix the ducting to the wall? It will (eventually :LOL: ) be boxed in but any bright ideas on how to fix along the wall would be great.

    Thanks for any help!!

    Bev
     
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  3. Taylortwocities

    Taylortwocities

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  4. holmslaw

    holmslaw

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  5. RMS

    RMS

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    That would look a mess. The simple solution would be a solid duct.
     
  6. Taylortwocities

    Taylortwocities

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    I agree, it would be a total horlicks. Maybe OK if it is to be boxed in, or if you live in a grass hut, like Holmslaw.
     
  7. holmslaw

    holmslaw

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  8. RMS

    RMS

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    Really?

    Depending on the length of the run there may be problem with condensation build up in the duct. Byusing solid duct you can angle it with a slight fall towards the outside. This would allow condensation water build up to run outside. This would not be achievable with flexi duct. The extra cost wont break the bank.
     
  9. Taylortwocities

    Taylortwocities

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  11. OwainDIYer

    OwainDIYer

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    if it's breaking through a garage wall (fire compartment?) would an intumescent collar be necessary or advisable?
     
  12. bernardgreen

    bernardgreen

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    Condensation will happen inside the pipe where it passes through the cold garage and be trapped in the folds of the flexible duct. It can then create a smelly mess in the duct. When the fan is not running the colder heavier air at the end of the duct will push the smell backwards into the warmer lighter air in the toilet room.

    Corrogated flexible duct also creates turbulant air flow wihich increases resistance to air flow in the duct reducing the amount of air that is extracted from the toilet room

    Use 100 mm drainage pipe and bends with, as mentioned, a slope down the exit into free air.

    Use brackets like this to secure the pipe. http://www.drainageonline.co.uk/110mm-Push-fit-Soil/110mm-Double-Fix-Soil-Pipe-Clip.htm
     
  13. ban-all-sheds

    ban-all-sheds

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  14. Taylortwocities

    Taylortwocities

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    We havent heard from Bev for a while? So we do not know if any of our suggestions have been taken on board.

    One thing to note is that many of the cheaper loo fans are not very powerful and will have trouble pushing air more than about 3metres up a duct.
    How long is the duct ?



    (Bernard, my 110mm pipe clips are half the price of yours ;) )
     
  15. bernardgreen

    bernardgreen

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    I took the first that Google offered. I could probably find them a lot cheaper somewhere. I note Ban did not offer a link for the source of nasal sensory inhibitors. One per family member and extraction would not be needed.
     
  16. ban-all-sheds

    ban-all-sheds

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    You could get the plastic ones, and match the colour to your tie (or undies).
     
  17. bernardgreen

    bernardgreen

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    Plastic pegs are as bad as downlighters.

    Sorry to be dragged ( or me dragging ) off topic.

    Valid point about extending the duct on a weak fan. Maybe the opportunity to fit a more powerful fan at the end of the duct. More powerful extract and much less fan noise inside the house. Less noise is a big advantange at the night when people are asleep when someone uses the toilet.

    Also ensure that replacement warm air can get into the room under the door or over opening from the house as that will compensate a bit for the longer duct. If the existing duct is corrogated it might be worth replacing that with smooth walled pipe.
     
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