For each room with specific pollution, ventilation is provided and its flow rate determined according to the nature and quantity of the pollutants and, where applicable, the quantity of heat to be removed, without the minimum fresh air flow rate being less than the values set in article R. 4222-6.
When the air comes from premises with non-specific pollution, the total number of occupants in the premises served is taken into account when determining the minimum fresh air intake flow rate.