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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Ventilation: MVHR and hot air heating external vents

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  1.  
    • 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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