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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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      CommentAuthordjh
    • CommentTimeFeb 5th 2016
     
    Posted By: Justinthe standard "minimum" can be too much at times

    I don't think that's surprising. I treat the 'minimum' as the minimum rate that it must be capable of delivering. In other words it's used for sizing the unit, not operating it. 30 m³/hr per person is a much more useful indicator of operational rate.

    We don't need to even use boost to clear after showers and the extra humidity is useful, though I can well believe condensation becomes an issue in a heavily used fully tiled bathroom. So I think the boost rate depends a lot on the design and use of the house.

    I seem to remember there is some explanation of where the part F rates come from, but I don't remember where I saw it. There are an awful lot of regulation and standards where it is less easy to discover why they say what they say than it should be. It seems to me that every law, regulation and standard should have an accompanying rationale document published with it and in the public domain.
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      CommentAuthorfostertom
    • CommentTimeFeb 5th 2016
     
    A good chunk of hygroscopic material - organic sheep wool or Warmcel filling the surrounding partition(s), or unfired clay (cob walls?) - can almost instantly soak up water vapour peaks, to be held harmless and released slowly as and when lo-rate background or MHRV can bring the raised air humidity back down.

    That's a good alternative to trying to remove the vapour peak 'as it happens' by bulk-air extract at high rate. With the FreshR MHRV now hitting the market, this is a counter-intuitive concept that the regulators, and individual Building Inspectors, are going to have got their heads around.
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