| 摘要 |
A total heat exchanger (15) exchanges heat between air flowing through an air supply passage (11) and air flowing through an air exhaust passage (12). An air supply fan (13) transfers air from the outside of a room into the room through the air supply passage (11). If the temperature of outdoor air (OA) is below a lower temperature threshold (Tth), a controller (60) intermittently stops the air supply fan (13) in response to an index of the moisture content in room air (RA) such that as the stage of the index of the moisture content depending on the moisture content in the room air (RA) shifts toward higher stages, the period of time during which the air supply fan (13) is at rest in an intermittent operating cycle increases. |
