Mechanical Extract Ventilation (MEV) is a ventilation system that supplies and extracts air continuously at a low rate. It is a low-energy, continuous mechanical extract ventilation system designed with multiple extract points to simultaneously draw moisture out of wet rooms such as bathrooms and kitchens. They provide a quieter and more efficient system compared to using separate fans to do the work.

With MEV, a central unit is usually mounted in a loft or a cupboard and ducted to extract polluted air from the wet rooms. As there is no heat recovery, there is no requirement for any ducts to supply the replacement air. Instead, replacement air enters through window vents or airbricks.

The removal of pollutants, such as moisture and buildup of indoor air pollutants are all important factors in maintaining good indoor air quality, helping to create a better working and living environment.

MEV units are ideal for both domestic and commercial properties.

Although MEV is a convenient and cost-effective way of extracting stale air and moisture from rooms, the removed air must be replaced. As buildings aren’t 100% sealed, air from the outside flows in.

This results in heat loss and can have an impact on heating bills and carbon emissions.

To mitigate this heat loss, a system was developed that returns heat to the building. Mechanical Ventilation with Heat Recovery (MVHR) follows a simple process. Warm air leaving the building is passed through a heat exchange unit containing a heat cube. The fresh cold air from outside is simultaneously passed through the heat exchange unit and is warmed in the process.

At FM Systems UK we install both MEV and MVHR systems to a wide range of customers including schools, offices and other commercial premises.