LOCK has developed the dual-rack LZG 17 DS ventilation drive specifically for Venlo greenhouses. This unit casts only minimal shadow because its extremely robust cast housing can be integrated in the main support, thereby placing both racks precisely above the grid with the drive tubes arranged below the roof guttering. Although its torque rating is just 72 Nm, this drive unit is designed to handle loadings of up to 9000 N. This means that this ventilation system can operate a climate controlled zone of up to 10 000 m2 using just two 600 Nm power drives.
Using full-length, 2-directional flaps, ventilation can be provided to enormous areas. They are also ideally suited to the use of insect netting.