| 摘要 |
PROBLEM TO BE SOLVED: To provide an air filter in which a plurality of filter materials with different collection efficiency can be replaced simultaneously and easily.SOLUTION: An air filter is arranged in a ventilation passage, and includes: a first filter material; a second filter material which has higher collection efficiency than the first filter material and is arranged on a downstream side of the ventilation passage than the first filter material; and a frame member which surrounds outer circumference parts of the first filter material and the second filter material and integrally forms the first filter material and the second filter material. Upstream side end parts of an upper surface and a lower surface of the first filter material and the frame member are adhered by a seal material linearly arranged in a direction intersecting an upstream and downstream direction. Downstream side end parts of an upper surface and a lower surface of the second filter material and the frame member are adhered by a seal member linearly arranged in the direction intersecting the upstream and downstream direction. |
