Patent ID: 8517356

Claim:
A ventilation device, comprising: a ventilator comprising a heat exchanger that performs heat exchange between exhausted indoor air and supplied external air; and a humidifier, comprising: a wicking device humidifying air passing therethrough from the ventilator; a first supply tank configured to store fluid therein, the first supply tank supplying the fluid stored therein to an upper portion of the wicking device; a second supply tank configured to store fluid therein, the second supply tank supplying the fluid stored therein to a bottom portion of the wicking device; a first fluid level sensor provided in the first supply tank and sensing a level of the fluid in the first supply tank; a second fluid level sensor provided in the second supply tank and sensing a level of the fluid in the second supply tank; a first supply pipe that connects the first and second supply tanks; a second supply pipe configured to connect the first supply tank to an external fluid source; and a supply valve provided in the second supply pipe and selectively controlling a supply of fluid to the first supply tank, wherein the supply valve selectively opens and closes the second supply pipe based on the level of the fluid in the first supply tank or the second supply tank sensed by the first fluid level sensor and the second fluid level sensor.