john-w Posted November 29 Share Posted November 29 Hi all. I've just moved into to a new(ish)-build apartment with a Nuaire MRXBOX95. There seems to be no ventilation in the bathrooms, and the apartment management seem very confused about how the MVHR is meant to work. It would be great if anyone could confirm or correct my understanding of the system, which is this: The MVHR unit ventilates 24 hours a day on a low power "trickle" mode When a bathroom is in use, the system should operate in a high power "boost" mode Boost mode would be activate via the bathroom light switch (as my bathrooms have no dedicated "boost" switch) Does that sound like a typical system? Am I understanding "boost" mode correctly. Are there exceptions to any of the above? Thanks in advance. Link to comment Share on other sites More sharing options...
jack Posted November 29 Share Posted November 29 Welcome to BuildHub. Some MVHR systems have a humidity sensor in the return (from the house) ducting, and enter boost mode when humidity rises above a certain level (e.g., due to steam from a shower). The humidity sensor could be positioned in the duct between the return manifold and the unit inlet. If you can access it, look for something poking into that duct with a wire coming out of it back to the unit. Not sure if your unit offers this option though. Link to comment Share on other sites More sharing options...
ProDave Posted November 29 Share Posted November 29 20 minutes ago, john-w said: There seems to be no ventilation in the bathrooms Are you saying there are no extract vents, usually on the ceiling, in the bathrooms? Link to comment Share on other sites More sharing options...
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