What is MVHR?

How ventilation works…

The MVHR system forms the ‘lungs’ of your home, allowing it to breathe properly. A typical set up consist of two parallel ducts that pass between the outside and inside of a property.

One of these ducts is for taking fresh air from the outside world and bringing it inside. The other allows dirty, stale, moist air to be extracted and released outside. Both run through a heat exchanger, which takes the heat from the outgoing air and injects it into the incoming fresh air supply.

Air Quality

  • MVHR provides a constant supply of fresh air in your home
  • CO2 spikes are prevented
  • Air pollution is controlled, preventing a build up, from your carpets, furniture or radioactive radon
  • Bad odours are removed
  • Pollen is filtered out, helping allergy sufferers.

Humidity Control

  • Damage to the building is prevented by constant ventilation
  • Mould, fungus, and dust mites are kept under control
  • Active dehumidification during cold weather periods.


  • Noise intrusion is reduced (windows can remain closed) allowing you to sleep better
  • Drafts are eliminated (in conjunction with an airtight building fabric)
  • The indoor climate is kept comfortable
  • Pests and midges are prevented from entering.

Energy Savings

  • Around 30% of your precious heating energy can be saved in air tight buildings with highly efficient MVHR systems when compared to normally ventilated environments. This saves you money and is kinder to the environment.

Why ventilation matters:

Control Humidity

Family life creates damp air. Properly maintained, your system controls this humidity.

Remove Pollution

Without proper ventilation, pollution concentrates more in your home than outside.


A properly maintained MVHR system reduces noise, drafts and insects inside your home.

Energy Savings

30% of your heating energy can be saved with highly-efficient MVHR when kept in good order.