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Trying to finalise my choice of MVHR unit. My main concern is to get something that is as quiet as possible. I know quietness is as much dependent upon the quality of the installation and where it is installed, and I think I have that covered in that I am hoping to install in the corner of my loft space, mounting the unit on an external brick wall, and that space is not adjacent to any bedrooms or living areas (it is just adjacent to a bathroom). But surely choice of unit plays a factor as well. Amongst my research I came across a Duco unit sold by BPC called the Ducobox Energy. What apparently makes this unique is that it has a two-zone system. BPC describe it as follows: A huge factor in the quietness of the system is that 2-zone system, as it reads where you are in your home and what needs ventilated you will not notice the system working. For example, at night, the unit will extract from areas such as your kitchen that are not being used, which ensures that the habitable rooms at that time such as bedrooms, will have no noise disruption. I had thought the best way of setting up the two-zone system would be for bathrooms, utility and kitchen to be zone 1 and the rest of the house to be on zone 2, as this would address my concern that whenever somebody had a shower or boosted to clear cooking smells, the unit's boost would be heard in the bedroom. We also run our tumble drier in the utility room overnight, so don't want the boost to kick in from that being heard in the bedrooms. However, on further research it appears that the zones need to be more "geographic", i.e. by location of the room rather than by its function. As the bathrooms are on the same floor as the bedrooms, segregating the bathroom ventilation from the bedroom ventilation probably isn't possible. It would however allow me to segregate the utility and kitchen from the bedrooms, so it would at least address part of my concern. Does anybody have any experience of this system?