| 摘要 |
A ventilator includes a fan ventilating a room, a human body detector for sensing presence or absence of a person or persons in each of a plurality of detection areas in the room, an air pollution sensor for sensing the level of air pollution in the room, a control circuit for varying a volume of air delivered by the fan in accordance with the number of detection areas for each of which the presence of a person or persons has been detected by the human body detector, and another circuit for adding a volume of air determined in accordance with the air pollution level sensed by the air pollution sensor to the volume of air determined in accordance with the detection result of the human body detector. The volume of air caused by the fan is automatically determined in accordance with the number of persons in the room and the level of air pollution in the room. |
