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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.

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Ventilation: bathroom extractor fan or single MVHR?

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    • CommentAuthorbardo
    • CommentTimeJan 20th 2021
     
    Just finished the build of a straw bale home. The external wall is 450cm + double board on board cladding making the duct length around 60cm. Ideally I would go for a single room MVHR extractor unit such as the Vent-Axia Tempra however with a max 45 com the in built ducting is too short. I have installed a 105 (ID) soil pipe though the bathroom wall to connect a standard extractor fan. Two questions. Do you know of a simple MVHR which would work with this set-up? Alternatively if I go for a simple extractor with humidistat/timer can you recommend a back draught unit which works well. If I can't exchange heat then the next best thing is to stop drafts. Cheers!
    •  
      CommentAuthordjh
    • CommentTimeJan 20th 2021
     
    This product will handle up to 700 mm wall thickness, but you won't like the diameter :cry: :bigsmile:

    https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/
    • CommentAuthorowlman
    • CommentTimeJan 20th 2021
     
    Too late for you I guess but I came across this the other day and thought it was interesting.

    https://www.ventilation-alnor.co.uk/index/news/industrial-news/hru-wall-wrev-window-reveal-module.html
  4.  
    You could look at the push-pull alternating single room mhrvs?
    I considered this one but didn't go for it in the end. Can be extended to several metres. It is an extractor fan that stores heat in a ceramic block, then changes direction and sucks air in over the ceramic to recover the heat.

    https://www.suedwind.it/en/ambientika-solo/4893273177366-1
    • CommentAuthorFred56
    • CommentTimeJan 20th 2021
     
    That Vent Axia would have been a trip into regret based in our experience. Horrible in every respect. The usual disfunctional Vent Axia humidistat controller and totally unacceptable noise levels. If that thing recovered any heat at all I would be truly amazed. Ludicrous price too.
    Our unit was in a laundry/drying room. Drying rooms are one of our strange preferences. Perhaps due to staying in so many youth hostels.
    • CommentAuthorlineweight
    • CommentTimeJan 21st 2021 edited
     
    Posted By: djhThis product will handle up to 700 mm wall thickness, but you won't like the diameterhttp:///newforum/extensions/Vanillacons/smilies/standard/cry.gif" alt=":cry:" title=":cry:" >http:///newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" alt=":bigsmile:" title=":bigsmile:" >

    https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/" rel="nofollow" >https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/


    How do these things avoid just sucking back in the stuff they've just blow out? Do they just try and blow out at the top and suck in at the bottom of the grille thing, or something like that?
    •  
      CommentAuthordjh
    • CommentTimeJan 21st 2021
     
    Posted By: lineweightHow do these things avoid just sucking back in the stuff they've just blow out? Do they just try and blow out at the top and suck in at the bottom of the grille thing, or something like that?

    Dunno about that particular model. Some do as you suggest and others do alternate blow and suck down the same pipe but I've never really looked into the subject - give me two separate pipes every time! Others may know more.

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