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New build MHRV question/ advice

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    #92
    newhouse87
    Registered Users Posts: 2,375 ✭✭✭newhouse87


    Friend of mine has new house built 2 years ago. Says he checked mvhr filters and they are still spotless? Mine are filthy after 9months. He hadn't changed filters since he moved in. Is That normal?



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    #93
    listermint
    Registered Users Posts: 33,911 ✭✭✭✭listermint


    https://www.boards.ie/discussion/comment/122112239#Comment_122112239

    Some models just require check and a clean rather than a swap.

    Also his unit may not be functioning well if its spotless....



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    #94
    newhouse87
    Registered Users Posts: 2,375 ✭✭✭newhouse87


    https://www.boards.ie/discussion/comment/122112381#Comment_122112381

    Anybody else I talk to has filters that are dirty after a year max. Doesn't make sense how you could have spotless filters especially in new build for first year or so.



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    #95
    testtech05
    Registered Users Posts: 2,094 ✭✭✭testtech05


    Our unit in 210m sq new build was set at 40/45% fan speed by the installers but when we had our airtightness etc done last week they suggested the air flow was too low and the fan speed should be increased possibly as far as 70%.
    We moved in in March and hadnt any issues with condensation or anything at 40% but Im just wondering what kind of questions I should be asking to confirm this is necessary?

    At 40-45 we couldnt hear the system but at 70 it is noticeable in quiet rooms



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    #96
    Biker1
    Registered Users Posts: 387 ✭✭Biker1


    https://www.boards.ie/discussion/comment/122114758#Comment_122114758

    If it was commissioned correctly you would have been given the flow rates for each room. This is then supposed to be verified by an independent third party tester (NSAI registered). From my experience any unit set at 40% never passes the test as the ventilation rates are always well below what is required.



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    #97
    newhouse87
    Registered Users Posts: 2,375 ✭✭✭newhouse87


    https://www.boards.ie/discussion/comment/122114758#Comment_122114758

    Mine was set to 40% and had some condensation first winter. 45% none. Upped it to 50 lately and house seems much fresher. No noticeable increase in noise or electricity. 70% is my boost and that would be too noisy to be running it at. Some on this thread were saying 40% was too high but reality is it isn't for well sealed house especially new builds.



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