| 摘要 |
<p>PURPOSE:To enhance air cleaning efficiency even when only one of polluted particle component and polluted gaseous component arises and when both thereof arise. CONSTITUTION:A ventilation route switching mechanism 12 is so constituted as to selectively switch and form the ventilation route for venting air only to a dust filter 9, the ventilation route for venting air only to a gas filter 10, and the ventilation route for venting air to both of the dust filter 9 and a gas filter 10 according to the rotating angle positions of a damper member 15. This ventilation route switching mechanism 12 is so controlled as to vent the air only to the dust filter 9 when only the detected quantity of the dust by the dust sensor exceeds a set value, to vent the air only to the gas filter 10 when only the detected quantity of the gas by the gas sensor exceeds the set value and to vent the air to the dust filter 9 and the gas filter 10 when the detected quantity of the dust and the detected quantity of the gas exceed the respective set values.</p> |
