Patent ID: 7497771

Claim:
A ventilating system comprising: a case having a first end locatable above a ceiling of a room, a second end opposite to the first end and locatable below the ceiling of the room and inside of the room, and a lateral side surface, the case including a first port at the lateral side surface thereof and connected to an air-supplying duct for introducing an outdoor air into the room; a second port at the lateral side surface thereof and connected to an air-discharging duct for discharging an indoor air to outside of the room; and an air-circulating passage in the case for introducing the indoor air into the case, and for re-supplying the air to the introduced indoor air into the room; an air guide located in the case, the air guide including a vertical division plate located in the case, the vertical division plate extending from the lateral side surface of the case at a location between the first port and the second port, the vertical division plate separating an indoor airflow into the case to be re-supplied into the room and an indoor airflow into the case to be discharged to outside of the room; a damper provided at the first port, for opening and closing the first port; a louver provided in the air circulating passage, for opening and closing the air circulating passage; a filter member provided in the air circulating passage, for purifying the room air or the outdoor air introduced to the case; and a single fan located in the air-circulating passage for supplying the outdoor air introduced from the first port to the room or for re-supplying the room air inhaled from the room, after purifying by the filter member; wherein the damper closes the air-supplying passage and the louver opens the air-circulating passage in purifying the room air, and the damper opens the air-supplying passage and the louver closes the air-circulating passage in supplying the outdoor air to the room.