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Can a chimney breast be used for external ventilation for gas fire?

Discussion in 'Plumbing and Central Heating' started by SJRSJR, 14 Nov 2017.

  1. SJRSJR

    SJRSJR

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    Hello. I'd like to get a Decorative Fuel Effect fire with a rating over 6.9 kw but I understand that the room will need additional ventilation. Can I use a second, separate, disused chimney breast in the same room for the vent or does it have to go directly outside? The breast currently has a couple of bricks missing so I hoped I could calculate the free air volume needed and install the right vent size. Also, the chimney is clapped with a C Cap for ventilation but I don't know the free air volume of that. Any advice? Thanks.
     
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  3. footprints

    footprints

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    Ventilation should be direct to outside.
    Trying to pull air down a chimney while the house is being warmed and hot air will be rising up the chimney is not going to work well anyway.;)
     
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  4. SJRSJR

    SJRSJR

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    Thanks. So would an air vent through the floor to a deep cavity which runs under the entire house and is ventilated front and back to the outside be acceptable?
     
  5. muggles

    muggles

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    Provided it has been correctly sized and installed, yes. Why don't you want to go directly to outside through a wall?
     
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  6. SJRSJR

    SJRSJR

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    Thanks for the reply. There's a huge amount of natural ventilation already - open plan, draughty etc so I don't want to start knocking holes in walls but I am getting a wooden floor installed so could incorporate a vent. So there are no circumstances where a chimney breast vent could be used?
     
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  8. muggles

    muggles

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  9. FiremanT

    FiremanT

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    It can be ducted from the floor to outside.

    If no duct, there must be NO communication under floor to a neighbouring property.The existing vents are probably terracotta, and are nearly always too small. you have to measure the smallest cross sectional area of the holes. A device is available to help with this.

    You absolutely cannot use the old chimney as a vent, as you cannot guarantee it will be working in the right direction, as per (?) footprints
     
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  10. dilalio

    dilalio

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    Op: your installer will handle all of this and advise you to the particular requirements of your individual case... it is not a one size fits all scenario... there are clear guidelines but these can be satisfied in many different ways according to install site conditions.
     
  11. FiremanT

    FiremanT

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    What fire are you considering?
     
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