MVHR

This is a mechanical ventilation system that uses a heat exchanger to recover the energy from extracted stale air and pre-heat the incoming fresh air.  It helps to improve the air quality in a building, reduce energy bills and maintain a comfortable internal environment.

As homes become increasingly airtight through efficiency measures such as insulation, draught-proofing and double-glazed windows, a lack of natural ventilation means that moisture created from everyday activities such as cooking, washing and even breathing remains in the home. With nowhere to go, this moisture collects on cold surfaces such as windows and outside walls and causes condensation, damp and mould growth, all of which contribute to poor indoor air quality (IAQ).

An MVHR unit is constantly ventilating a property, meaning that everyday moisture has no time to settle on surfaces as it is extracted to the outside, eliminating the risk of structural and cosmetic damage caused by condensation and mould. They are also extremely efficient, being able to recover up to 91% of heat lost through extraction and transferring it to incoming air.

How does it work?
MVHR systems continuously extract moist, stale and polluted air from the wet rooms of a property such as bathrooms, utility rooms and kitchens. This air is passed over a heat exchange cell which recovers and retains the heat that would otherwise be lost from the extracted air. This heat is then transferred to incoming fresh, filtered air that the unit is resupplying back into habitable rooms such as bedrooms and living rooms, resulting in minimal heat losses and a more comfortable indoor environment.