PROBLEM TO BE SOLVED: To solve such problems that a conventional insect proof net has a structure that the insect proof net is stretched on site, each work such as connecting, stretching and fixing frame bodies and/or plastic films is required, labor and experiences are required, thus needing improvement thereof, and further, insect pests might be invaded from defects of the connecting points, problems caused by the invasion of the insect pests due to the defects might be considered, and the improvement thereof is required. SOLUTION: The insect proof net is a solid shape in which a space region is formed of a plurality of frame bodies and the insect proof net stretched in the frame body. An opening for an environmental fan is formed at a mounting side of the insect proof net. The opening can be mounted tightly on the frame body of the environmental fan. Further, the insect proof net for the environmental fan is made of mounting members provided in building frames of the building, installed at a position facing to an end panel of the opening, and hung from the building frame. COPYRIGHT: (C)2012,JPO&INPIT
