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De-Centralised MVHR

  • 06-09-2022 11:39am
    Registered Users Posts: 24


    we moved into a newbuild 2 years ago and we are having major problems with ventilation on the third floor bedroom. As in it is not really existent. There is no vent, and the room is extra hot all year long (south facing). We have to keep the windows open all the time and even then the air does not seem to be moving.

    I have been looking at decentralized MVHR for the bedroom. I currently do not have a duct up there, so one has to be made. Does anyone have expreince with running such unit in a bedroom, are they noisy? What would be a good supplier installer for such unit?



  • Registered Users Posts: 522 ✭✭✭mike_2009

    There are a few suppliers - VentAxia, Blauberg etc. Are you going to core drill through the wall for the vent or go through the roof / info the attic? Is this in a warm roof or is there a 3rd floor below the roof? I looked into a few models that connect together to balance the house. Some have two vents with a small heat exchanger to perform both extract and intake duties. I've not used/seen one outside a bathroom in person so the noise element I can't comment on. BPC Ventilation might be worth talking to up north, they ship to ROI. Mitsubishi did a small unit if I recall.

  • Registered Users Posts: 24 theknightbg

    This is the bedroom on the third floor, so there is nothign else below the roof. I was looking for something that can potentially go through the roof. I already have a small extractor in the room, which was installed by the builders.

  • Registered Users Posts: 522 ✭✭✭mike_2009

    Most of the decentralized units are wall based. I've a MVHR with roof extract and supply vents using glidevale instead of tiles installed by a roofer (retrofit). Not sure I've seen any of the smaller units use/accept 200mm vent pipes or if Glidevale do smaller. Talk to BPC and see what they suggest. Sounds like a warm roof / room in roof. You will have a gable end you could use to mount this but depends on wind direction.