CHAPTER 01 – APPLICATIONS Ventilation types 3 2026 | 05 Ventilation types for Venlo greenhouses Flaps ventilation > Here one drive unit on each side of the roof opens several individual ventilation flaps down the primary longitudinal roof beam, as well as flaps in the adjacent sections. > This is where you will find the LZG range of gear units in operation, in rail ventilation applications. Open-Roof ventilation > Type A as an continous system with central ventilation tube under the primary roof ridge: this is where the ZSG, AZD and EZD ranges of rack drives are used. > Type B with push-pull system: this is where the LZG ranges of rack & pinion unit are used. > Please note our notes for Open-Roof ventilation systems, see page 4. Full-length ventilation > On each side of the roof, a ventilation flap opens along the line of the primary roof ridge. A drive system opens several flaps on adjacent sections of the greenhouse. > Here, systems are used with in top of the other as well as adjacent parallel push-pull systems with LZG rack & pinion units. On this page, we illustrate special-purpose ventilation systems that are used for the Venlo design of Dutch greenhouse.
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