Abstract: The modular system with double ventilation--mechanic and thermic--for the reduction or annulment of the formation of fog banks, that determines the slowest possible cooling of the ground and of the adjacent air layers maintaining their temperature higher than the steam condensation one, comprises an internal combustion engine (1) for the production of mechanic and thermic energy to be used for heating the soil as well as the movement of the air masses above; a plurality of propellers (2) of different dimensions for opposing the phenomenon of the thermic reversal that occurs in the night, when the warm air rises to the higher layers, while the cold air moves down to the lower ones; and a pipe system (3) for heat dispersion which acts as a radiator and in the same time produces an ascensional current of warm air that pushes into the higher layers the fog possibly formed.