Claims1. A system for treating and distributing air in a greenhouse, comprising at least one outflow opening connected to an air treatment device for locally introducing treated air into the greenhouse and a distribution unit corresponding substantially in vertical direction to the outflow opening for locally distributing in the greenhouse the air introduced into the greenhouse via the outflow opening.2. A system according to claim 1, wherein the distribution unit comprises a distribution fan which, in operation, draws in, in axial direction, the air introduced into the greenhouse via the outflow opening and distributes it in radial direction.2a. A system according to claim 2, wherein below the distribution unit a horizontal plate is provided with an adjustable opening therein.3. A system according to claim 2, wherein the distribution fan comprises upright vanes. 3a. A system according to claim 3, wherein the distribution fan comprises a flexible plate with which the position of the vanes can be adjusted.4. A system according to any one of the preceding claims, wherein the outflow opening is placed substantially in vertical direction below the distributing unit.
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