Method for controlling a system for ventilation, heating, air conditioning and/or purification of several zones of a premises , said system comprising at least a member for regulating an airflow and a device for heat treatment of an airflow and/or a device for purification treatment of an airflow circulating in said system , the system further comprising a ventilation device , the regulation member including a box comprising: - an inlet adapted to receive a flow of air, called fresh air, from the ventilation device , called first inlet, - an inlet adapted to receive a flow of air, called recirculated air, from the heat treatment device and/or from the airflow purification treatment device , called second inlet, - a plurality of nozzles adapted to be each connected to a respective duct of the system to bring an airflow into a respective zone of the premises , each nozzle being associated with at least one respective zone of the premises , each nozzle comprising: - a first portion fluidly connected to the first inlet and forming a first air outlet , - a second portion fluidly connected to the second inlet and forming a second air outlet , the member further including, for each of the nozzles , a device for regulating a flow rate of fresh air, called first regulation device, disposed in the first air outlet , the first regulation device being movable between a position of total closing of the first air outlet and a position of total opening of the first air outlet , the method comprising the following steps: - comparing a value of at least one parameter, called parameter value, relating to at least one component of an air to a given value, called comparison value, in each of the zones , the method being characterised in that if a ratio, called pollution ratio, of said parameter value to said comparison value is greater than or equal to a value equal to 1, called unit value, in at least one of the zones , called polluted zone, - increasing of the flow rate of fresh air by said first regulation device of the nozzle associated with said at least one polluted zone, and/or - increasing a flow rate of recirculated air passing through the nozzle associated with said at least one polluted zone. - an inlet adapted to receive a flow of air, called fresh air, from the ventilation device , called first inlet, - an inlet adapted to receive a flow of air, called recirculated air, from the heat treatment device and/or from the airflow purification treatment device , called second inlet, - a plurality of nozzles adapted to be each connected to a respective duct of the system to bring an airflow into a respective zone of the premises , each nozzle being associated with at least one respective zone of the premises , each nozzle comprising: - a first portion fluidly connected to the first inlet and forming a first air outlet , - a second portion fluidly connected to the second inlet and forming a second air outlet , - a first portion fluidly connected to the first inlet and forming a first air outlet , - a second portion fluidly connected to the second inlet and forming a second air outlet , - comparing a value of at least one parameter, called parameter value, relating to at least one component of an air to a given value, called comparison value, in each of the zones , - increasing of the flow rate of fresh air by said first regulation device of the nozzle associated with said at least one polluted zone, and/or - increasing a flow rate of recirculated air passing through the nozzle associated with said at least one polluted zone. <EOS>