A mechanical ventilation facility by continuous insufflation of a premises, such as a residential or office premises, enabling continuous renewal of the air in said premises, comprising: - an air insufflation module including at least one intake nozzle of air from outside said premises (10, 11), connected to an air intake duct connected to an insufflation chamber containing a fan and means for preheating the incoming air, at least one blown air duct and at least one nozzle for blowing air into said premises, - first relative humidity sensors and first temperature sensors, positioned inside the premises to be ventilated, making it possible to measure the relative humidity and the temperature of the air inside said premises, respectively, - second relative humidity sensors and second temperature sensors, positioned downstream from the preheating means, making it possible to measure the relative humidity and the temperature of the incoming air, respectively, - a computing and control unit monitoring the insufflation air flow rate, on the one hand based on the humidity and temperature of the air of said premises to be ventilated, and on the other hand the humidity and temperature of the incoming air, the humidity taken into account to control the insufflation air flow rate being the absolute humidity, computed from measured relative humidity and temperature data, characterized in that the air intake duct in the insufflation chamber includes filtration means and is connected to a plurality of air intake channels (27, 28), each channel being connected to an intake nozzle for the air (10, 11) captured in different locations outside the premises to be ventilated, and being equipped with tiltable or steerable intake flap(s), for the air coming from one or several intake nozzle(s) up to the air intake duct, based on the temperature and/or humidity of the captured outside air, in order to minimize the intake of outside air having an absolute humidity higher than the absolute humidity of the air inside said premises. - an air insufflation module including at least one intake nozzle of air from outside said premises (10, 11), connected to an air intake duct connected to an insufflation chamber containing a fan and means for preheating the incoming air, at least one blown air duct and at least one nozzle for blowing air into said premises, - first relative humidity sensors and first temperature sensors, positioned inside the premises to be ventilated, making it possible to measure the relative humidity and the temperature of the air inside said premises, respectively, - second relative humidity sensors and second temperature sensors, positioned downstream from the preheating means, making it possible to measure the relative humidity and the temperature of the incoming air, respectively, - a computing and control unit monitoring the insufflation air flow rate, on the one hand based on the humidity and temperature of the air of said premises to be ventilated, and on the other hand the humidity and temperature of the incoming air, the humidity taken into account to control the insufflation air flow rate being the absolute humidity, computed from measured relative humidity and temperature data,