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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.

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    • CommentAuthormorsing
    • CommentTimeOct 1st 2017
     
    Hi,

    Part of our annual hot air system service is to check the rooms with the inlet grilles have external vents. As part of installing MVHR I would want to block those up, but would the gas inspector be happy with that?

    Thanks
    • CommentAuthortony
    • CommentTimeOct 1st 2017
     
    Odd, is it a heat the air and throw it away system? Or does it recirculate? Open flue gas? 1950/60's house with air vents in bedrooms?
    • CommentAuthormorsing
    • CommentTimeOct 1st 2017
     
    Hi,

    It recirculates and I think it's open flue but I'm not an expert. Mid-70s build, air vents in all rooms.

    Thnaks
    • CommentAuthortony
    • CommentTimeOct 1st 2017
     
    You might need to consult gas safe but I would aim at closing off all the external vents bar one for boiler air supply.

    Undercut doors and run is as a recirculate system.

    For condensation problems beware of furniture against outside walls restricting air circulation and heat from the room. Some info here http://readinguk.org/draughtbusters/galleries/condensation/
    •  
      CommentAuthordjh
    • CommentTimeOct 1st 2017 edited
     
    Which rooms have inlet grilles and/or external vents?

    Posted By: morsingMid-70s build, air vents in all rooms.

    I had a house like that in the mid 70s but as I recall it just had one big intake in the hall at the bottom of the stairs and outlets in every room.

    Has the boiler/furnace been updated or replaced since then? I'd think a 1970s unit would probably be very inefficient.
    • CommentAuthormorsing
    • CommentTimeOct 2nd 2017 edited
     
    Hi,

    Boiler is new(-ish) from 2010.

    Thanks
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