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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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  1.  
    Hi all,
    First post on here.

    I have searched around and the subject of wood burning stoves and mvhr has been covered but not quite the situation I have.
    I am building an extension - the part of the original house that remains is old, leaky etc. The new extension is being built with lots of care and attention to detail but without a particular air tightness target.
    I am installing an MVHR mostly to avoid having to install little useless extract fans in the kitchen, utility, downstairs toilet, bathrooms as required by building control. I hate those little fans which do nothing except make noise.
    I want to install a small stove in the living/dining area. Can anyone see a reason these won't be compatible or is there anything in particular I should look out for? I know on really airtight houses there can be issues.
    Unfortunately, the location for the stove is not on an outside wall so a direct air supply isn't possible.
    I guess I'll have to have the requisite free ventilation area although there is plenty of leakage available already in the house.

    Thanks,
    Dave.
    • CommentAuthorgyrogear
    • CommentTimeJun 25th 2016
     
    Posted By: DavegilsenanUnfortunately, the location for the stove is not on an outside wall so a direct air supply isn't possible.


    Not necessarily a criterion - have you got a basement or a crawlspace, to allow routing an intake under the floor?

    gg
    • CommentAuthorCWatters
    • CommentTimeJun 26th 2016
     
    Our BCO asked where our air brick was and I told him we had a whole house vent system. He was OK with that but you might get a different answer.

    I don't think our house is particularly air tight and the two wood burners seem ok. Certainly never had a down draught. Presumably they just give the incoming fan an easier time and make the outgoing fan work harder eg it becomes unbalanced. I reckon that's OK if you don't plan to run the wood burner every day.

    Might be different in an air tight house.

    Even more essential to install Carbon Monoxide detectors if you are going to bend the rules.
    • CommentAuthorjfb
    • CommentTimeJun 26th 2016
     
    Over 5kw and you have to have an air brick I think. I have a 5kw burner with MVHR that is slightly over pressurised and no direct air input in a pretty airtight house (1 ACH) and all seems well.
  2.  
    Thanks for the replies- they're encouraging.

    I'l try to get hold of building control again- he's hard to get hold of.

    Gyrogear - no basement or crawlspace.

    I'll definitely have a CO alarm

    JFB- do you have an airbrick? Do you set the supply fan volume higher than extract?
    • CommentAuthorjfb
    • CommentTimeJun 26th 2016
     
    no air brick since at the 5kw threshold. For my MVHR set up the commissioning process just involved putting differently sized restrictor rings at each supply/extract in the manifolds (it is not trunk and branch but individual ducting to each supply/extract point from two manifolds) that was all calculated by the supplier. When they did this they slightly over pressurised it (presumably in the supply to the room where the burner is) but I don't know the exact details of by how much.

    Hope that helps.
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