34 What is centralised heat recovery ventilation? Centralised heat recovery ventilation (CHRV) combines the best of both worlds by keeping air fresh and warm at a low cost. To do this, CHRV systems pump out stale air and renew the indoor atmosphere with clean, fresh air. However, before it is completely exhausted from the building, a heat exchanger within these two airflows transfer the warmth leaving the property to the fresh air coming in. By doing this heat transfer, centralised heat recovery ventilation systems can help keep homes at a consistent temperature efficiently and cost-effectively. How does it work? 2. Fresh, clean air is constantly drawn into the home through the supply air ducts from the outside. 3. Stale air extract is continuously extracted from moisture-prone areas such as kitchens, bathrooms and cellars. 1. Fresh air flows through a heat-exchanger inside the unit, where it is preheated using the heat recovered from the extracted air. Extract air Extract air Fresh air intake Bathroom Kitchen
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