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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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    • CommentAuthorsplashie
    • CommentTimeApr 29th 2015

    This might be a bit last min for you guys, but I can find nothing online to help me.

    Got to put in the MHRV outlet / supply roof vents in tomorrow and it's still unclear if I need to be a certain spacing from a window in the manner you do for a soil pile vent.

    As far as I can work out my two vents need to be 1m apart edge to edge, and I'm keeping them as far from the soil vent as I can (approx 1.5 or more higher up the roof)

    If you do have any thoughts or can signpost me to regs feel free to share!

    many thanks
    • CommentAuthorEd Davies
    • CommentTimeApr 29th 2015 edited
    Try BRE Digest 398 which has a few paragraphs on vent positioning. It was available online (borpin referenced it a while back) but that copy's gone. Couldn't immediately find another. Don't really want to post the whole thing here as I think you're supposed to pay for it but relevant paragraphs:
    The contributions previously all said aim for 2m. I managed 180 odd and I angled my vents at 45 deg away from each other. 1m feels like the minimum I would imagine working without confliction. My primary point though is don't underestimate the noise the external vents might make. I didn't put attenuators in mine and on boost they sound like not that far distant jet engines - there is no way you would have an open window near when mine is on boost - just something (else) to think about. :wink:
    • CommentAuthorCWatters
    • CommentTimeMay 1st 2015
    Make sure the incoming vent is upwind of your boiler flue.
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