France is one of the European countries where ventilation has the most advanced regulation. Vertical ducts have been used for a very long time, making easier the transfer from passive to mechanical ventilation ( which covers now 90 % of the blocs of flats and 70 % of the individual housing) . 1969 regulation has been based on a continuous air exhaust from the service rooms and air replacement through inlets in the habitable rooms. This has never been changed since then and is a part of french regulation's features.
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