If you are designing or building homes and looking to aim for higher than standard airtightness, HiPer Haus can help you with the design, supply, integration and commissioning of MVHR systems
When should we consider MVHR for our projects?
MVHR systems provide controlled ventilation and are most effective when installed in properties with good air tightness levels. For the best operation of a MVHR system we recommend achieving an air tightness level of at least 5 ACH at a pressure test (q50), with an ideal target of below 3 ACH.
We believe setting air tightness goals is essential for both new builds and refurbishment projects.
Other criteria for installing MVHR (other than air tightness)
1. Noise: if a property suffers from noise, e.g. traffic or airport, MVHR systems with adequate silencers will provide a good solution for ventilation without the need to open windows. Additionally noise reduced glazing will help.
2. High condensation: MVHR systems will actively dehumidify when it is outside colder than inside.
3. Air quality: if the air quality is problematic, various kind of filtration in MVHR systems can deal with pollen, rural and industrial smells.
Integrating MVHR into your projects
When integrating a Mechanical Ventilation with Heat Recovery (MVHR) system into a home, several important considerations need to be taken into account to ensure the system performs optimally and adds value to the indoor environment.
Building Design and Air Tightness
MVHR systems are most effective in well-sealed homes. Therefore, one of the primary considerations is the air tightness of the building. In highly insulated, airtight homes, the system can maintain a consistent flow of fresh air without compromising energy efficiency. For older homes or those with more leaks, additional sealing or insulation may be required to reduce the loss of warm or cool air, maximising the MVHR’s benefits. If installing an MVHR system in an existing home, a blower door test can help assess the building’s air tightness, helping to identify areas that may need sealing before installation.
Space for units & ductwork
Centralised MVHR systems typically require sufficient room for the MVHR unit and the ductwork to run between the rooms. Considerations like where the main unit will be housed need to be thought through early in the planning stages. The duct for the system is generally installed within the thermal envelope (on the internal side of the insulation layer)