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    • CommentAuthorguiminho
    • CommentTimeSep 11th 2009
     
    Hello,
    I am constructing a new build which will contain a open fire in the living room. Is there any dampers which can be installed in the chimney to prevent the loss of hot air during the periods that the open fire is not in use?

    Scheidel do make a firechest with a damper as an option but i have been unable to obtain very little information on the damper option and it seems very expensive.
    I have looked at Cast Iron dampers but these seem to be only for vitreous enamelled flue pipe of closed appliances such as log burner.

    Is there any safety reasons why a damper can't be installed in an open fire.

    Many thanks for any help or advice
    guiminho

    Ideally i would have preferred a log burner for effeciency, but the open fire has been overruled for aesthetic reasons as much as anything. :shocked:
    • CommentAuthorCWatters
    • CommentTimeSep 11th 2009
     
    Try asking these people. We found them helpful..
    http://www.specflue.com/
    They run Hetas training courses.
    • CommentAuthorguiminho
    • CommentTimeSep 11th 2009
     
    Many thanks CWatters for your comments
    I phoned specflue today but the largest damper size that they sell is 7", where the flue pipes will be 8" in the chimney. Also these dampers seems to be more for woodburning stoves, as the connected into steel flues
    • CommentAuthormike7
    • CommentTimeSep 12th 2009
     
    <blockquote><cite>Posted By: guiminho</cite>Hello,

    Is there any safety reasons why a damper can't be installed in an open fire.

    </blockquote>

    Because it is lethal at quite low levels, carbon monoxide is the big danger from appliances where there is inadequate air supply to get complete combustion, but I suspect this is not at all likely on an open fire. Anyway I made my own damper to fit in the rectangular duct at the top of the hood over my fireplace. It works just fine to prevent draughts when there is no fire as you intend, but when we do have a fire I also use it to restrict the airflow to the minimum - plus a bit - needed to ensure the smoke goes the right way. (I was very impressed by how small the opening could be.)

    If you can't buy what you need and can't diy it, maybe you could get a small metalwork shop to make one up for you. It is simple enough and doesn't need to be a precision job. Probably best if it can't quite shut completely so there is always a minimal opening, and clearances are generous so it won't rust solid over time. Don't forget it will need to be somewhere not in the way of the chimney sweep.

    By the way, something that only dawned on me recently, and I'm not sure if it is generally understood is that it pays to have an open fire hearth as low down as possible, even below floor level if you can. This allows you to have the top of the fireplace opening - or the bottom of the hood - correspondingly low. Warm air above this level won't be drawn up the flue or diluted by cool air coming in, but the stratum of air below this level will tend to be cooler, so you want it as shallow as possible. You may still have cool feet, but warm knees. Hope that helps.
    • CommentAuthorcrusoe
    • CommentTimeSep 14th 2009
     
    Try HETAS at www.hetas.co.uk or 0845 634 5626

    Not sure if open-fire dampers are even listed in approved appliances' lists any more. At one time they used to be fitted to a number of prefab fires like Jetmaster and Kedddy.

    And don't forget the largest fire size you can have is a direct funtion of the flue size, other factors like the height of the flue having a bearing too.

    Crusoe
    • CommentAuthorguiminho
    • CommentTimeSep 21st 2009
     
    Many thanks, I will contact HETAS and follow their advice
    • CommentAuthorMiked2714
    • CommentTimeSep 21st 2009 edited
     
    Posted By: crusoe
    Not sure if open-fire dampers are even listed in approved appliances' lists any more. At one time they used to be fitted to a number of prefab fires like Jetmaster and Kedddy.


    Do you mean that Jetmaster fires don't have a damper any more? That was going to be my suggestion.

    Mike
    • CommentAuthorguiminho
    • CommentTimeOct 5th 2009
     
    HETAS passed my enquiry to solidfuel.co.uk, who very helpfully recommended a Throat Restricter by Red Bank.
    Considering my options whether to go for this or the Jetmaster
    Many thanks for all assistance
    • CommentAuthorsimeon
    • CommentTimeOct 6th 2009
     
    I am surprised that open fires in new build can get through building regulations on overall house insulation and air tightness. Also, they are very inefficient in operation even to the extent they can produce a negative thermal efficiency for the house overall. Don't they go against everything green?
    • CommentAuthorhowdytom
    • CommentTimeOct 9th 2009
     
    I agree simeon, all open fires should be banned, in fact I think the government should bring in legislation/grants to replace them. massive savings in Co2 etc.
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