MVHR (Mechanical Ventilation with Heat Recovery System)
What is MVHR?
Mechanical Ventilation with Heat Recovery (MVHR) is a whole house ventilation system that supplies fresh air and extracts contaminated or damp air in a property. Air is extracted from the wet rooms, such as kitchens, bathrooms and WC’s. The extracted air is used to heat the incoming air (without mixing with it). Up to 95% of the heat, normally wasted in the vented air, is recovered and reused. The pre-warmed fresh air is distributed to the other rooms in the property such as bedrooms, lounge, dining rooms etc.
The MVHR unit uses low energy, low noise fans along with low velocity ductwork to minimise system noise and to keep system running costs to a minimum.
The running costs are a small fraction of the heating cost saved by the heat recovery.
The system runs a low extract/supply level during normal operation but goes into boost mode when it detects high humidity levels or is triggered by a light switch or proximity sensor in the “wet” rooms.
During the summer months the heat recovery is bypassed, bringing in cooler fresh air and venting warm air to the outside.
For those who suffer from sensitivity to airborne pollutants, a filtration system can be optionally incorporated on the inlet air.