| 摘要 |
<p>PROBLEM TO BE SOLVED: To prolong use period while maintaining dust removal performance by a filter.SOLUTION: An outside air intake system 150 includes a blower unit 158 and a filter unit 156 in an outside air intake pipe 154 extending from an outside air inlet 151 to an outside air outlet 153 which is an outside air outlet inside a housing. A filter 300 of the filter unit 156 has a particle collection ratio of 95% or more with respect to particles with a particle diameter of 0.3μm, at the rated air volume of equal to or more than 10 m/min. The blower unit 158 blows the outside air toward the outside air outlet 153 via the filter 300 by a built-in blower 158a, and the air volume at that time is made to be 1-4 m/min.</p> |
