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.
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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.
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The running costs are a small fraction of the heating cost saved by the heat recovery.
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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.
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During the summer months the heat recovery is bypassed, bringing in cooler fresh air and venting warm air to the outside.
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For those who suffer from sensitivity to airborne pollutants, a filtration system can be optionally incorporated on the inlet air.
