To solve a problem that although there is no structure which a shutter installed in a greenhouse is provided with an insect screen conventionally, a net is detachably provided on a ventilation fan for a building, and for example, the insect screen is provided on an air passage provided on a ventilation hood main body part or an opening part of a ventilation louver outer wall to prevent an insect from invading, while in either case, no attention is paid to an air quantity passing the insect screen, a fundamental problem.

The shutter for agriculture and a building is provided with a supporting board provided on a frame body, a shutter part structured of a plurality of shutter plates pivotally fitted on the supporting board through mounting metal fittings with an appropriate interval, a frame body supported by the building connected to the shutter part, and a fan part structured of a fan provided on the frame body. A net part structured of a foldable net provided on the frame body located in a space of the shutter part and the fan part is arranged, and a direction of folding the net is made orthogonal to an opening direction of a shutter plate.