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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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    • CommentAuthoranth.payne
    • CommentTimeApr 11th 2017
    After all the great help on my previous thread, I think I'm pretty happy with where I got to on the fabric, and heating...

    One area I've started researching is the glazing. We have quite alot of glazing, and it's important to us that we have good quality windows (and doors). We will have two glazed gable ends which will be fixed, with large lift & slide doors on the adjacent walls.

    To that end, I have come across Internorm, who seem to be highly regarded...

    I was reading about their 'I-Tec Ventilation' option, and wondered whether this could in fact replace ductless MHRV units?


    They claim an air exchange of 40m3/hr with an automatic mode that responds to humidity and temperature and has a built in heat exchanger with 85% efficiency...
    • CommentAuthortony
    • CommentTimeApr 11th 2017
    I have a very high regard for internorm and love their windows

    I cannot see how that new product could replace a proper MVHR and can't see it getting certified, tempting but what problems will there be if or when it goes wrong?
    • CommentAuthoranth.payne
    • CommentTimeApr 11th 2017
    In terms of certification, I'm not too fussed about gaining PH cert... just want everything to work as it should. So if this solution offered appropriate ventilation, then it could be a winner... especially since there'd be a window in every room (not that you'd necessarily have the i-tec system in every window).

    The alternative I'm looking at is something like the FreshR.

    However, I;d never thought of future maintenance. I'm not sure how accessible the ventilation unit would be?

    It also seems a bit vague in terms of how the heat recovery works
    • CommentAuthorCX23882
    • CommentTimeApr 14th 2017
    It looks like the fan unit is on the side of the window.
    Presumably you would only fit it to the side of an opener (e.g. a tilt and turn), and the fan unit can be removed from inside the opening.

    I note that there are no comments about noise levels. I'd imagine it's probably fine at trickle speeds (probably quieter than trickle vents due to there being no direct path to outside), but possibly horrendous at boost, and I don't see how it could ever be quieter than a well designed MVHR installation.
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