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bathroom extractor

Discussion in 'General DIY' started by geome, 7 Apr 2016.

  1. geome

    geome

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    I am fitting a bathroom extractor fan the bathroom has an existing vent via an outside airbrick if I remove the vent can I put my new 4inch ducting upto the old airbrick or will this restrict the airflow.
    Would it be better to cut a hole in the airbrick and put the ducting through it with an outside backdraft shutter.
     
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  3. endecotp

    endecotp

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    It will restrict the airflow, but perhaps not by too much. Personally I'd try it and see.
     
  4. foxhole

    foxhole

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    You are putting 4" out thru 10" vent? will not restrict flow.
     
  5. geome

    geome

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    Yes but the 10 inch brick is not a straight through outlet it's made up of a series of holes which in total might not
    Add up to the volume of the 4 inch pipe.
     
  6. If it was a toilet, there wouldn't be an issue, but being a bathroom, you're extracting moisture laden air that is going to condense on to the cold airbrick, and eventually cause a problem. Use tubing and an outside shutter, and remember to have a slight downward slope towards the outside for the water to drip away.
     
  7. foxhole

    foxhole

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    Had the same thing on my bathroom for 20 years , never a problem.
     
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