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Discuss kingfisher CF 150 with aspestos flue in the Central Heating Forum area at

  1. firemant

    firemant Plumber GSR

    I apologise. I misconstrued your comment. I had it in my head that you meant that the calculation should be done taking the screen into account.
    Obviously, fly screen awareness IS relevant, as you say.
  2. jtsplumbing

    jtsplumbing Plumber GSR

    Those old type plaster vents didn't have a fly screen
    • Disagree Disagree x 1
  3. Gasmk1

    Gasmk1 GSR

    well i have come across quite a few of this type over the years that have a fly screen so best to check

    Plaster Vent With Fly Screen 225mm x 75mm
    • Agree Agree x 2
  4. DaveTidy

    DaveTidy Active Member

    Agreed. There were many types of old plaster vents that came with a flyscreen stuck to the back as many of the louvres used to break easily when trying to remove them.

    Generally when you had a plaster vent, you also had a terracotta vent on the outside which was very restrictive and passed very little air. The vents were large and generally too small; even the small holes in the terracotta were tapered so they looked smaller form the outside but were even smaller on the inside!

    Again, many of these vents used to be blocked with cavity wall insulation. The flyscreen would stop it coming through the louvre and the terracotta would be so small they would just block.

    All a bit negative but very relative; when you actually got a tape measure to the opening you would find many of them actually didn't have enough ventilation so best to check.
  5. DaveTidy

    DaveTidy Active Member

    Generally if one of these old plastered vents us present there us usually a terracotta vent outside that passes very little air due to it's construction so I would also be looking at this also as it us in the equation and more than likely insufficient.
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