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Vent for gas in ceiling duct

Discussion in 'Plumbing and Central Heating' started by DaleRCL, 11 Dec 2019.

  1. DaleRCL

    DaleRCL

    Joined:
    29 Mar 2009
    Messages:
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    Thanks Received:
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    Location:
    Hertfordshire
    Country:
    United Kingdom
    Good Evening All,

    We have a gas pipe running through a ceiling duct. The duct is 0.3m x 6.0m so to my calculations, the duct has a cross sectional area of 1.8m2. This means that we need to install a vent with a minimum of 0.05m2 of free area. (Please correct me if you believe that any of the above is incorrect.)

    My problem is, is that I can not seem to find anywhere online a vent that comes close to having this amount of free area.

    I would welcome any advice on where I could purchase such a vent or on whether I have miscalculated in the first instance.

    Thank you in advance.
     
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  3. That sounds like a rather large duct - is this a void above a ceiling or a huge duct?!

    The cross sectional area is width x height - are the figures you've given correct? (is the 6m quoted actually the length?)
     
  4. DaleRCL

    DaleRCL

    Joined:
    29 Mar 2009
    Messages:
    211
    Thanks Received:
    12
    Location:
    Hertfordshire
    Country:
    United Kingdom
    Hi Newboy,

    Yes, you are right, it is a void above a ceiling. The void is 0.3m high and the room is 6m wide. It is not a purpose made duct, just a dropped ceiling.
     
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    DIYnot Local

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