Abstract: The ventilation system is a system for ventilating a building and comprises an air supplier/exhauster comprising air supply function and exhaust function and a ventilation control device controlling the operation of the air supplier/exhauster. Upon operating the air supplier/exhauster, the ventilation control device determines which the air supplier/exhauster conducts, air supply operation or exhaust operation, based on wind information regarding the outdoor wind. The ventilation through the ventilation passage from the air supplier/exhauster to a vent provided in the building is conducted when the air supplier/exhauster conducts air supply operation. Alternatively, the ventilation through the ventilation passage from the vent to the air supplier/exhauster is conducted when the air supplier/exhauster conducts exhaust operation.

Abstract: The ventilation system is a system for ventilating a building and comprises an air supplier/exhauster comprising air supply function and exhaust function and a ventilation control device controlling the operation of the air supplier/exhauster. Upon operating the air supplier/exhauster, the ventilation control device determines which the air supplier/exhauster conducts, air supply operation or exhaust operation, based on wind information regarding the outdoor wind. The ventilation through the ventilation passage from the air supplier/exhauster to a vent provided in the building is conducted when the air supplier/exhauster conducts air supply operation. Alternatively, the ventilation through the ventilation passage from the vent to the air supplier/exhauster is conducted when the air supplier/exhauster conducts exhaust operation.

Abstract: The first temperature measurer measures an first air temperature in a first place and transmits a measurement result to a system controller. The second temperature measurer measures an second air temperature in a second place and transmits a measurement result to the system controller. The sucker sucks air from the first place into a duet installed in the building. The discharger discharges the air taken from the first place via the duct into the second place. The system controller determines whether it is necessary to adjust an air temperature difference between the first and second places based on the first air temperature and the second air temperature. If the system controller determines that the adjustment is necessary, the system controller orders the sucker and discharger to start operation.