| 摘要 |
PROBLEM TO BE SOLVED: To provide an air cleaning machine capable of surely judging the exchange time of a filter. SOLUTION: In the air cleaning machine in which indoor air sucked from a suction port 2 by a fan 4 driven by a motor 3 is passed through the filter 5 and blown into the room from a discharge port 7, there are provided a revolution number detecting means 8 for detecting the revolution number of a fan motor 3, a control means for keeping the revolution number of the motor constant by comparing the revolution number of the motor 3 detected by the revolution number detecting means 8 and a standard revolution number, and an information means for reporting the exchange time of the filter in the case when the motor revolution number control signal by the control means is issued more than a prescribed times within a fixed time. |
