Greenhouse with netting system

1. A greenhouse comprising a roof construction,

wherein the roof construction comprises a slanting upper surface, a first framework that defines a roof opening, and a rectangular ventilation window that covers the roof opening,

wherein the ventilation window is hingeably connected with the first framework to hinge around a first hinge axis between a closed position in which the ventilation window extends substantially parallel to the upper surface and an open position in which the ventilation window is oriented oblique with respect to the upper surface to form a ventilation passage,

wherein the ventilation window comprises a panel and a second framework along at least a distal front edge and two parallel side edges of the panel,

wherein the greenhouse comprises a netting system to prevent passage of insects through the ventilation passage,

wherein the netting system comprises an insect netting between the first framework and the second framework that covers the ventilation passage and that is pleated in a bellow configuration to collapse in a stacked manner, and a guiding provision for the insect netting,

wherein the guiding provision comprises an elongate guiding bow between the first framework and second framework that has a curvature around the first hinge axis and that extends along the insect netting,

wherein the insect netting is slidably connected with the guiding bow,

wherein the guiding bow is suspended from the second framework,

wherein the guiding bow is hingeably connected with the second framework,

wherein the guiding bow is slidably connected with the first framework, and

wherein the guiding bow tilts toward the first hinge axis when the ventilation window hinges from the open position to the closed position,

wherein the guiding bow is hingeably connected with the second framework at a second hinge axis,

wherein the guiding bow is slidably connected with the first framework by a guide piece of the first framework, and

wherein a distance between the guide piece and the first hinge axis of the ventilation window is shorter than a distance between the second hinge axis and the first hinge axis of the ventilation window such that in the closed position of the ventilation window a longitudinal axis of the guide bow is directed downwardly from the ventilation window.

2. The greenhouse according to claim 1 , wherein the guiding bow has a constant radius with respect to the first hinge axis.

3. The greenhouse according to claim 1 , wherein the guiding bow extends along the inner side of the insect netting.

4. The greenhouse according to claim 1 , wherein the guiding bow extends at least partially through the roof opening.

5. The greenhouse according to claim 1 , wherein the insect netting comprises a series of bellow sections that are connected to each other,

wherein a plurality of the bellow sections are distributed along the guiding bow and are slidably connected with the guiding bow.

6. The greenhouse according to claim 1 , wherein the guiding provision comprises a series of hooks, brackets or eyes that are attached to the insect netting, each of the series of hooks, brackets, or eyes having a respective opening, and

wherein the guiding bow extends slidably through the respective openings of the series of hooks, brackets, or eyes.

7. The greenhouse according to claim 1 , wherein the guiding bow comprises an elongate rod, bar, profile, wire or tube having the curvature.

8. The greenhouse according to claim 1 , wherein guiding bow is made of metal.

9. The greenhouse according to claim 1 , wherein the guiding provision comprises a stiffening that is connected with ends of the guiding bow and that extends freely from the guiding bow between the ends of the guiding bow.

10. The greenhouse according to claim 9 , wherein the stiffening comprises an elongate counter bow.

11. The greenhouse according to claim 10 , wherein the stiffening comprises an elongate rod, bar, profile, wire or tube.

12. The greenhouse according to claim 9 , wherein the stiffening is made of metal.

13. The greenhouse according to claim 9 , wherein the guiding bow and the stiffening are a form stable assembly or unity.

14. The greenhouse according to claim 1 , wherein the insect netting comprises a front panel merging into two side panels,

wherein the front panel of the insect netting is slidably connected with the guiding bow.

15. The greenhouse according to claim 1 , wherein the insect netting comprises elongate gauze webs that are connected to each other along a longitudinal outer edge thereof.

16. The greenhouse according to claim 15 , wherein the gauze webs comprise a woven textile with warp threads and crossing weft threads that alternatingly go over and under the consecutive warp threads,

wherein the warp threads and the weft threads each comprise at least one strand.

17. The greenhouse according to claim 1 , wherein the guiding bow is hingeably connected with the second framework at a second hinge axis, and

the guiding bow tilts toward the first hinge axis of the ventilation window more than 10 degrees when the ventilation window hinges from the open position to the closed position.

18. A netting system to prevent passage of insects through a ventilation passage of a roof construction of greenhouse,

the netting system comprises an insect netting configured to be provided between a first framework of the roof construction and a second framework of a ventilation window hingeably connected with the first framework, the second framework being configured to hinge around a first hinge axis between a closed position in which the ventilation window extends substantially parallel to the upper surface and an open position in which the ventilation window is oriented oblique with respect to the upper surface to form the ventilation passage,

wherein the insect netting is configured to cover the ventilation passage and is pleated in a bellow configuration to collapse in a stacked manner,

the netting system further comprising a guiding provision for the insect netting,

wherein the guiding provision comprises an elongate guiding bow between the first framework and second framework that has a curvature around the first hinge axis and that extends along the insect netting,

wherein the insect netting is slidably connected with the guiding bow,

wherein the guiding bow is suspended from the second framework,

wherein the guiding bow is hingeably connected with the second framework,

wherein the guiding bow is slidably connected with the first framework, and

wherein the guiding bow tilts toward the first hinge axis when the ventilation window hinges from the open position to the closed position,

wherein the guiding bow is hingeably connected with the second framework at a second hinge axis,

wherein the guiding bow is slidably connected with the first framework by a guide piece of the first framework, and

wherein a distance between the guide piece and the first hinge axis of the ventilation window is shorter than a distance between the second hinge axis and the first hinge axis of the ventilation window such that in the closed position of the ventilation window a longitudinal axis of the guide bow is directed downwardly from the ventilation window.