MVHR Systems provide controlled ventilation with slow but constant air movements. Therefore it is recommended to install such systems only in properties with relatively good air tightness.  Air tightness targets should always be set for new build projects, as well as when refurbishing properties.

MVHR systems combat three typical issues with properties, namely:


if a property suffers from noise, e.g. traffic or airport, MHRV systems with adequate silencers will provide a good solution for ventilation without the need to open windows. Additionally noise reduced glazing will help.

High Condensation

MVHR systems will actively dehumidify when it is outside colder than inside.

Air Quality

if the air quality is problematic, various kind of filtration in MVHR systems can deal with pollen, rural and industrial smells.

The general benefits of MVHR systems are:

Air Quality

  • Continuous supply of fresh air to provide good indoor air quality
  • No extreme CO2 peaks
  • Minimised air pollution – from carpets, furniture etc
  • Elimination of bad odours
  • With windows closed, few insects gaining entry

Humidity control

  • Preservation of the building fabric through steady ventilation
  • Keeps mould, fungus, dust mites etc from establishing
  • Active dehumidification in the cold season.


  • Less noise inside as windows can remain closed which means increased (undisturbed) sleep
  • No drafts, when used in conjunction with an airtight building fabric
  • Improved indoor climate

Energy saving

  • Approximately 30% of the heating energy can be saved in air tight buildings with highly efficient MVHR systems compared to naturally (uncontrolled) ventilated buildings.

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