| 摘要 |
<p>An air filter capable of efficiently arresting carbon particles from dust in the air while maintaining a long service life and suppressing a cost, comprising a first filter layer (11) soaked with oil and a second filter layer (12) disposed on the downstream side of the first filter layer (11) and forming an oil-repellent layer having an oil repellent property, wherein the filter material of the first filter layer (11) is formed denser than that of the second filter layer (12).</p> |
