| 摘要 |
Data of a barometric pressure that a barometric pressure sensor 47 outputs, and data of an air volume that an air-volume sensor 49 outputs are input into a system control circuit 40. The system control circuit 40 is provided with a table storing portion 40a. In the table storing portion 40a, a control table is stored. The control table is formed of a plus supplied-voltage value to fan power set by a barometric pressure value and an air-volume value, and a warning instruction. In a case that the warning instruction is selected based on the barometric pressure value and the air-volume value, the system control circuit 40 turns on a warning-use LED 50 so as to inform a user that a filter is clogged. |
