Mechanical ventilation with heat recovery (MVHR System)


An Ecologic SIP build system provides a vast improvement on airtightness when compared with more traditional construction methods, therefore careful attention needs to be considered to the ventilation method requirements to create and maintain a healthy living environment and indoor air quality. MVHR systems, in combination with the excellent insulating properties of a SIP structure, greatly improve the energy efficiency and ultimately reduce your carbon footprint (in excess of 90% improved efficiency considering heat loss).

MVHR facts:

  • The average family of four produces up to 18 litres of water vapour every day through normal activities such as bathing, cooking, and even breathing
  • Healthy buildings usually require a full change of air every two hours, when meeting an air permeability level of less than 5m³/m²hr
  • Indoor air can be up to ten times more polluted than outside air
  • They are designed to quietly operate 24×7 continuously circulating fresh filtered air through the structure
  • Tackles unwanted moisture, pollutants and viruses as well as strong smells from pets and cooking as well as noises from outside
  • Property size will dictate unit power consumption which can average around 30 – 120 Watts on normal running speed and up to around 200 watts on full boost for larger units
  • Typical running costs of modern single unit ranges from £40 to £60 per annum, meaning you’ll save on heat energy more than it costs to run

How do they work?

In a typical application, moist, stale air is extracted from wet rooms (kitchens, bathrooms, utility rooms). The air passes through a high-efficiency heat exchanger which utilises the heat from the stale air and transfers it and uplifts the temperature to the incoming fresh air. This pre-warmed drier fresh air is delivered to all other habitable rooms.

Most heat exchanger systems will recover up to 90 – 95% from the heat of the outgoing air, saving energy and money on heating costs. A typical house temperature of 20°C will uplift from incoming temperatures of below zero to give around 18.5°C to habitable rooms. However, summer bypasses ensures that a small tempering of the air through the same heat exchanger.

Click on the video link to learn about How MVHR Works”


Our MVHR partners

We’ve teamed up with independent MVHR specialists ADM Systems. They were pioneers in this technology in the early 90s, and have worked within the private and public sectors, designing, supplying, installing (and maintaining) bespoke MVHR systems for well over 30 years.

They offer a wide range of units to suit all specifications and budgets. Including the popular top quality Zehnder ComfoAir Q units, (click here to download the technical datasheet to learn more about their characteristics and outputs).

For more information on the benefits and features of MVHR systems and the optimum size required for your property please contact ADM Systems.