In small homes, an HRV might consist of a single unit on one wall that effectively ventilates the entire building over time as doors open and close between rooms. In larger homes and offices, there may be ventilation grids in each room feeding into ducts that run between the floors or ...
To ensure a good supply of fresh air, it is recommended that any property designed to achieve an air-leakage rate of 3 m3 /hour/m2 at 50 Pa or better should use mechanical ventilation. By fitting a mechanical ventilation heat recovery (MVHR) system, which uses the heat from out...