5. A system according to any one of the preceding claims, wherein the outflow opening is placed below the level of plants grown in the greenhouse and the distribution unit is placed above the level of plants grown in the greenhouse.6. A system according to any one of the preceding claims, wherein between the outflow opening and the distribution unit an auxiliary channel is provided for bringing air introduced into the greenhouse via the outflow opening near the distribution unit. 7. A system according to any one of the preceding claims, wherein the air treatment device is placed adjacent the outflow opening.8. A system according to any one of the preceding claims, wherein the outflow opening is connected via an air duct to the air treatment device. 9. A system according to claim 8, wherein the air duct comprises a number of spaced apart outflow openings for locally introducing treated air into the greenhouse at a number of locations.10. A system according to any one of the preceding claims, wherein per outflow opening and corresponding distribution unit, local distribution of treated air is provided in the greenhouse over an area of approximately 150 m2 to approximately 250 m2.
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