VENTILATOR

PROBLEM TO BE SOLVED: To continue an operation of a ventilator with stored electric power when power supply in a direct current (DC) power distribution system is shut down.SOLUTION: The ventilator has a configuration including: a power supply detecting means 2 for detecting an input voltage; a backup power supply 3 storing electric power from the system of the DC power distribution system; a diode 4 for preventing the stored electric power from discharging to the system of the DC power distribution system; a discharge switching means 5 discharging the power of the backup power supply 3 to the system of the DC power distribution system; a discharge suppression switching means 6 having a resistance value for suppressing a current to discharge the power of the backup power supply 3 to the system of the DC power distribution system; and a control means 7a. By employing such a configuration, the ventilator is obtained in which the control means 7a controls switching of the discharge switching means 5 and the discharge suppression switching means 6 with the use of the voltage detected by the power supply detecting means 2, thereby discharging the power of the backup power supply 3 to the system of the DC distribution system, consequently driving of terminal equipment in the same system is continued even when power supply is shut down.