| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost by commonization of a circuit board. SOLUTION: A ventilator comprises a CO2 sensor 106 for detecting a CO2 concentration in a room, and a gas sensor 107 for detecting a gas concentration in the room on the circuit board 2 contained in a ventilator body. The ventilator further comprises a slide type selection switch 6 for arbitrarily selecting the sensor 106 and the sensor 107 to be operable on the circuit board 2. The switch 6 can be used even for gas sensing as for detecting the CO2 or further for sensing (the CO2 + the gas) by switching the switch 6 on one circuit board 2. |
