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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.

Buy individually or both books together. Delivery is free!


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    • CommentAuthorowlman
    • CommentTimeSep 9th 2018
     
    Thanks Dave, I know lots of aircon installers use the pre-insulated stuff usually comes compressed in 10M boxes and hence handy. I guess however it's prone to sagging with all the airflow implications that implies, so I kind of discounted it, plus the insul. doesn't look the best to me.
    The semi- rigid is an option and although the spiral rigid can be cumbersome in an existing loft situation and requires accurate measurements, it's usually considered the best. I hadn't considered square.
    • CommentAuthorowlman
    • CommentTimeFeb 25th 2019 edited
     
    I've finally got most of my Air to Air system installed. The outdoor compressor is in situ on it's dedicated plinth/platform and the interconnecting cable and refrigerant pipework almost complete. Controller is in as are the supply and return ceiling grilles and plenums. All that remains now is to insert the "Indoor Unit" and the ducts that connect it to the supply and return plenums.
    The plenums were fabricated to accept a 300mm supply, and a 315mm return duct, but I'm having last minute doubts that the supply side may be slightly oversized and 250mm may be better for 2 x 4.5+M runs.
    Of all the interior work I've done over the years configuring a good ducted warm air system has been the most difficult. It seems to me to be a real black art.
    Pity there's no RHI
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