**7. Glass greenhouses basic structural elements**


The photos below show the greenhouse galvanized, painted in white steel frame and the roof frame, vent insect, and bird screens (preventing penetration of insects that may cause or carry diseases to crops and birds that can damage the plants). Also, it could be seen a glass outer surface cleaning machine (**Figures 3**–**6**) [2].

**Figure 3.** *Greenhouse cleaning, washing and disinfection (Kucura, Serbia).*

*Advantages of Growing Vegetable Crops in Modern Greenhouses DOI: http://dx.doi.org/10.5772/intechopen.101469*

**Figure 4.** *Glass greenhouse-galvanized steel frame (the Netherlands).*

**Figure 5.** *Roof and side vent insect and bird screen (crop protection against insects and birds).*

**Figure 6.** *Greenhouse glass roof washer.*
