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Today’s well insulated indoor climates may be good for our energy bills, but not so good for our health and indoor air can be as much as five times more polluted than outdoor air. The problem stems from a lack of air renewal – the days of natural ventilation being readily available through small leakages or gaps in the fabric of our houses have all but disappeared. Windows and doors are tight, walls and ceilings are sealed by vapour barriers and any sign of moisture on the inside of double glazing can be a symptom of an unsatisfactory indoor climate.

For health reasons, it’s important to maintain a proper humidity level in the home. Too little humidity can cause personal discomfort issues whilst too much moisture can make a home a breeding ground for mould and mildew. Some homes may also have moisture problems only at certain times of the year, such as in spring when there is a lot of ground water run-off, while other properties need help to control moisture levels all year round. In some instances moisture is a problem only in one room or area, but this should not be neglected.

What is Mechanical Ventilation with Heat Recovery (MVHR)?

This provides continuous 24-hour whole house extract ventilation and heat recovery:

  • Stale, moist air is extracted from wet rooms
  • A heat exchanger within the unit transfers up to 90% of the heat into fresh air
  • The fresh air is then supplied into habitable rooms
  • Summer bypass allows the fresh air to be supplied without heat recovery


Zehnder ComfoAir

Zehnder Mechanical heat recovery and ventilation solutions  are our preferred choice for energy efficiency and the provision of excellent air quality. Passive House accredited and complying with System 4 of the current Building Regulations, the Zehnder range of domestic HRV and ERV units that ensure balanced whole house ventilation and a year-round comfortable, healthy and energy efficient indoor climate.

Buildings come in many different sizes and layouts so it is vital that the same level of indoor air quality can be maintained in every one.  Zehnder’s range can be customised to meet the individual requirements of any residential or commercial building, from smaller apartments through to large, luxury houses in both new build and renovation projects.

The ultra quiet Zehnder ComfoAir Q heat recovery system provides 100% of the ventilation requirements to a home and therefore filtration of supply air is crucial to the well being of the occupiers including allergy sufferers. Zehnder ComfoAir Q filters measure the volume of air that travels through, always looking to keep optimal performance.

ComfoAir Q also constantly measures air quality using optional CO2 sensors. This automatically guarantees a constant balance of supply air and extract air volumes. The supply air volume is adjusted to the air quality in the individual rooms and ensures a healthy indoor air climate. This Flow Control controller perfectly combines optimum, healthy air quality with maximum energy savings.

By means of heat recovery from the extract air, the system provides not only good quality air, but also pre-cooled or pre-heated air, depending on the season. The world class 96% performance of the ComfoAir Q heat exchanger is achieved through an innovatively designed diamond shaped heat exchanger that maxmises heat transfer with 25% more surface area. When comparing two MVHR units, one with 87% heat recovery efficiency and one with 94%, a 25% reduction in heating costs is achieved by reducing the heat lost through the ventilation process.

A Passive House must always have an integrated MVHR system. Only the highest quality of ventilation is acceptable to ensure stringent humidity control and for air tempering. The Passive House comfort standard means that only those components that have been rigorously tested and approved can be used within the building. ComfoAir and  ComfoPost air to water exchangers meet these requirements.

The Zehnder Enthalpy Exchange recovers both the thermal and the latent energy from stale air extracted from wet rooms around the home which would otherwise have been wasted. This extra energy is transferred into the incoming fresh air stream before being supplied to habitable rooms.

By choosing Enthalpy rather than a standard heat exchanger, the unit becomes an Energy Recovery Ventilation system (ERV).

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Lindab Airy Valve

Lindab is a world leader in sustainable solutions for the construction industry and control of the indoor environment with products designed to simplify construction. as a selected ventilation partner, lindab’s products are recognised for their sustainability, energy efficiency, high quality, ease of assembly and simple installation.

Lindab products help to create the highest levels of indoor air comfort and prevent energy losses. the market leading residential indomo integrated radial duct system  features LFPE semi-rigid ducts made of odourless polyethylene without recycled material to ensure no contaminates are present. the inner duct features anti-static additives and has microbial properties  to EN ISO 9969. manifolds, plenum boxes, and accessories are also combined to create building regulation compliant systems that meet SAP Appendix Q Guidelines for simplified energy efficiency calculations.