Modern humidity sensitive air inlets for installation in the windows of PVC, wood and aluminum. By adjusting the air inlets corresponds to a polyamide which responds to the level of humidity in the room. Depending on the prevailing humidity of the ventilator automatically opens or closes providing the necessary amount of air. The air inlets also has a switch that allows you to manually shut down at any time. SM HY outside air pressure and is ideal also in systems of mechanical ventilation based on humidity sensors in the fan and the exhaust grille.