Bellow-shaped insect netting for a ventilation window of a greenhouse and a greenhouse

A greenhouse comprising:

• an inclined roof including an opening and a ventilation window which is rotatable between a closed condition in which it covers the opening and an open condition in which the opening forms a ventilation passage;
• and
• an insect netting, which is mounted to the ventilation window and surrounding edges around the opening, the insect netting comprising:
• a bellow-shaped insect netting for a ventilation window of a greenhouse, having a folded condition in which the insect netting is compacted and an unfolded condition in which the insect netting forms at least a first wall and a second wall which are angled with respect to each other and meet each other at a corner portion, thus forming an inner side and an outer side of the insect netting, wherein the insect netting comprises a plurality of bellow sections, wherein each bellow section has a first bellow section portion and a second bellow section portion, which are fixed to each other at one of the inner side and the outer side so as to form a plie and lie onto each other in the folded condition, wherein the first bellow section portion comprises a first strip along the first wall and a second strip along the second wall which are fixed to each other through a first seam at mutual rims of the first and second strips of the first bellow section portion which face each other at the corner portion, and the second bellow section portion comprises a first strip along the first wall and a second strip along the second wall which are fixed to each other through a second seam at mutual rims of the first and second strips of the second bellow section portion which face each other at the corner portion, wherein the first seam and the second seam have different locations at the corner portion as seen in a direction perpendicular to a plane in which the bellow section lies in the folded condition of the insect netting.