depends on two elements working together: a continuous supply of fresh air coming in and a reliable method of extracting stale, humid air out. For properties that may be located near airports, busy roads, or areas with higher outside noise, Zehnder also makes an acoustic vent to provide greater noise reduction and avoid this issue. The ideal choice for many homes is a continuously running decentralised Mechanical Extract Ventilation (dMEV) fan, such as the new Zehnder Unity CV2.1HT. This smart fan continuously runs at a ‘trickle’ rate for year-round ventilation, drawing fresh air through the home from the window vents and then extracting stale, moisture-laden air from kitchens, bathrooms and other wet rooms outside. This balance helps regulate humidity levels, prevent condensation and mould, and ensure indoor air remains clean and healthy – all for a running cost of less than £2 per year.


The Unity CV2.1HT meets the evolving needs of households for enhanced air quality and energy efficiency - providing sustainable, user-friendly ventilation solutions that are more in line with changing habits and lifestyles in residential properties.


Ideal for both new builds and renovations, the Unity CV2.1HT is a truly smart fan. Whisper quiet and with intelligent sensors that adapt to its environment, the fan is not only designed not to be heard, but its clever humidity sensor can activate a boost function during rapid rises in humidity to clear the air quickly, whilst also keeping quiet during periods of low activity, for example at night. This reduces unnecessary heat loss and energy wastage.


escalate, safeguarding the structural integrity of the building.


In some cases, despite having a ventilation system that should theoretically be effective, condensation problems still arise. This could indicate the system needs to be reviewed or was installed incorrectly to begin with. No ventilation system, inspected and installed correctly by a competent M&E contractor, should have humidity build up to that degree.


The Zehnder Unity CV2.1HT also features a memory function as standard, meaning it can retain its settings even after extended periods of inactivity, including loss of power - ideal when a room is not occupied for extended periods or during power cuts.


The ideal choice for bathrooms, wet rooms and en-suites, the decentralised air system can be mounted on walls, windows, or in ceilings to minimise disruption to existing structures. It offers adjustable ventilation rates with 100% variable airflow to meet on-site regulatory requirements. Managing condensation in buildings and homes, requires this multi-faceted approach. Upgraded insulation must be considered in partnership with an effective ventilation system to help regulate indoor humidity levels and promote a healthy indoor environment, minimising the conditions conducive to condensation. Routine inspections and maintenance are essential to identify and rectify potential issues before they


Alternatively, if a property is a multi-purpose space or has seen alterations in its layout, be it through expansion or refurbishment, this complexity is further compounded. What may have once constituted an effective method of air circulation during the initial construction may no longer prove suitable. For example, when a house is converted into multiple flats or apartments or vice versa.


Adjusting the ventilation system to address these modifications isn’t always a feasible option and, in these cases, systems will need renewed consultation to assess the requirement and maintenance going forward.


Addressing condensation is not just a matter of maintenance and reinforcing good resident behaviours – although education is an important part of it. It’s about the strategic investment required in future-proofing the longevity and performance of building structures as well as people’s health.


For more information visit the website.


www.zehnder.co.uk BKU DECEMBER 2025 31


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