The ETR251/46 gear rack drive is a low-maintenance, purpose-designed drive for starting and closing swinging-atmosphere vents in Venlo-type greenhouses. The combination of TR251/46 equipment rack drive and aEP RW electric motor gearbox plays a part in an optimum greenhouse climate because of accurate positioning of the air vents.

The self-supporting TR251/46 gear rack drive comprises a zinc-plated C-profile with an integral compact gear rack drive unit. The TR251/46 equipment rack drive is mounted to a greenhouse gutter using the item clamp-mounting forks or bows.

Thanks to the apparatus reduction stage (i-2.76) and the pinion of the TR251/46 equipment rack drive, the drive torque is effectively changed into a optimum rack force of 4200 N. Monitor rollers in the C-profile and guideline blocks ensure stable expansion and planetary gearbox retraction of the rack. The drive shafts of the TR251/46 gear rack drive have long, flat-sided journals. This makes it possible to fit drive shafts (prefab) installed with weld/sleeve couplings or chain couplings, after the house units have been mounted. The drive shafts are locked in the couplings by the accompanying shaft retaining clips. The TR251/46 gear rack drive is simple to maintain.

A ETR251/46 equipment rack drive with other C-profile lengths and rack lengths is available on request.