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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Regulate the air flow for MVHR

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    • CommentAuthorchuckey
    • CommentTimeApr 28th 2008
     
    I need to install some form of MVHR for my bathroom. The problem is that its sooo windy here so a simple extractor, a, looses heat and b, will not extract in the teeth of a raging gale. I have seen the waves in the toilet bowl splashing up and down by about 1/2" due to wind pressure/vacuum on the stack pipe.
    Has any one seen any system that works. I was thinking of using a pair of gravity flaps sealing on a rubber covered frame (to stop the clanking when working). But there would be a lot of development time/effort to get it working. Sort of thing I was thinking about, 4" diam input/output, full bore up to a wind speed of 4mph, reducing to say 5% cross sectional area at 20 mph. pipes. Any ideas?
    Frank
    • CommentAuthorhowdytom
    • CommentTimeApr 30th 2008
     
    How about constructing a short chimney out side the bathroom and fitting one of those extractor cowls for fires, then fitting a manual internal shutter, circular or square ones are readily available from DIY stores, you could fit a electric fan within the wall duct for the odd calm day !. If your bathrooms like ours there isn't that much heat to bother trying to capture it.
    tom
    • CommentAuthortony
    • CommentTimeApr 30th 2008
     
    Some fan manufacturers make heat recovery single room units where air is drawn in at the same time it is blown out and the incoming air is preheated by the exhaust air.

    Why ever this is not a requirement of building regulations I dont know -- all this talk about energy efficiency and then they blast away a load of heat via a fan.
    • CommentAuthorchuckey
    • CommentTimeMay 1st 2008
     
    Tony, my point is that with these because of the high winds, both the extract and input air flows will be totaly overloaded by the winds, i.e. when the wind blows, cold air will be coming out of the extract fan as well as out of the inlet duct. I already have this with a downstairs toilet extract fan. The vent hole is actualy sealed by a motor driven plug, that only opens when the fan is running then closes again. On windy days the "extract" is admitting wind driven air 50%(?) of the time. To put a MVHR unit that is open in a much less sheltered position would be asking for trouble.
    Frank

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