| 摘要 |
PURPOSE:To contrive the reduction of a pressure loss caused by adhesion such as dust by fixing a fixed part of a net provided between a body and a hood on a periphery rather than the diameter of the body, and providing a space between the body and the net. CONSTITUTION:A space 4 is provided between a net 3 and a body 1,and in addition the net 3 is fixed with a peripheral part rather than the diameter of the body 1. Thereby, dust and the like mixed in an exhaust current 12 or a supply air current 13 to adhere to the net 3 largely adhere to the center part of the diameter of the body 1, but it takes time to adhere to the periphery rather than the diameter D and early lowering of a wind quantity caused by a use period can be prevented. |
