| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which, in a conventional ventilation device, even when estimated filter replacement timing differs depending on a use environment, as the replacement timing is set by operation time collectively, a filter cannot be used efficiently.SOLUTION: In a ventilation device, a suction port 8 and a discharge port 9 are provided at a housing 2, and a blower 3 for taking in outside air to the indoors is provided. It also includes an air cleaning filter 4 for cleaning outside air on the suction port side, and the air cleaning filter 4 is slide-stored in a rail 5 which is provided facing the inside of the housing. A powder dust sensor 6 is provided on the further discharge port 9 side than the air cleaning filter 4, and the powder dust sensor 6 detects a powder dust amount after the powder dust is removed by the air cleaning filter 4. A control unit 7 is provided for recording and calculating the average of the powder dust amount measured by the powder dust sensor 6 for every arbitrary time. The control unit 7 notifies that the powder dust amount measured by the powder dust sensor 6 has reached a predetermined value. |
