Section 2: Non-specific pollution rooms

In premises with non-specific pollution, ventilation is provided either by mechanical ventilation or by permanent natural ventilation. In the latter case, the premises have openings opening directly to the outside and their controls are accessible to the occupants.

Ventilation by natural ventilation, provided exclusively by the opening of windows or other openings giving direct access to the outside, is authorised when the volume per occupant is equal to or greater than : 1° 15 cubic metres for offices and premises where light physical work is performed; 2° 24 cubic metres for other premises.

Where ventilation is provided by mechanical means, the minimum fresh air flow rate to be introduced per occupant is set out in the following table: DESIGNATION OF PREMISES MINIMUM FLOWof fresh air per occupant(in cubic metres per hour) Offices, rooms without physical work 25 Catering premises, sales premises, meeting rooms 30 Workshops and rooms with light physical work 45 Other workshops and premises 60

Rooms reserved for traffic and rooms that are only occupied occasionally may be ventilated via adjacent rooms with non-specific pollution to which they open.

The air sent after recycling into premises with non-specific pollution is filtered. The recycled air is not taken into account when calculating the minimum fresh air flow rate provided for in Article R. 4222-6. In the event of a breakdown in the purification or filtration system, recycling is stopped.

It is forbidden to send polluted air from a room with specific pollution, after recycling it in a room with non-specific pollution.