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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 15th 2021
     
    Posted By: Simon StillI guess I'd only really need to worry about the incoming air as that's the only one that causes an issue.

    Well the exhaust duct is cold as well, hopefully? The supply and extract ducts are at approx room temperature.
  1.  
    As you'll know, the intake AND exhaust is essentially external air temperature (exhaust slightly warmer), so you can't avoid condensation on the duct skin in winter, unless insulated. You ought to have the same level of insulation on the ducts as you have in your walls/loft etc, since it's a piece of the outside world, inside your house


    Yes, of course. me being stupid. The Domus insulation is what we've used for the rigid duct, but my issue is the final connection from the end of the rigid duct to the MVHR unit.

    Not possible to match insulation level do to the location so I did the best I could. There are always compromises. The amount of condensation we get at the unit (where it is worst insulated) is not much but I'd like to improve it.
    • CommentAuthorGreenPaddy
    • CommentTimeFeb 15th 2021
     
    tape polythene to the unit spiggot, wrap the flexy duct with say 100mm loft roll, then enclose it with the polythene and tape the top end to the insulated rigid duct. Tape up the polythene joint/lap. Do a second wrap of polythene if you want to be sure. Main thing is to keep the house air away from the duct.
    • CommentAuthorjms452
    • CommentTimeMar 30th 2021
     
    Posted By: TonyI like Boulder, metal case, never any problems, economic, available


    Just looked at their units - they look cost effective up front but the SFP is triple many units

    https://www.ventilationmegastore.co.uk/product/dhv-15b-unit/

    I make that about a kWh/day additional power consumption which is significant
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