| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that freezing and dew condensation occur inside a heat exchange element when a conventional heat exchange type ventilating device is used in a bath room, etc., as high-humidity air passes an exhaust air passage side and cold air passes an air supply side.SOLUTION: Indoor humidity is measured by an indoor humidity sensor 13 in heat exchange operation. When the indoor humidity increases and humidity at a predetermined value or higher is detected, an opening of an air course shielding part 12 on an upstream side of a heat exchange element part 11 of an air supply blowing path 6 is closed, introduction of outdoor air to the inside of the heat exchange element part 11 is blocked to deter dew condensation and freezing inside. The air supply blowing path 6 is shielded to decrease a work amount of an air supply fan 8, and a work amount of an exhaust fan 9 mounted to the same rotation shaft is increased to efficiently exhaust the indoor air and to lower the indoor humidity. |
