The ETR251/46 equipment rack drive is a low-maintenance, purpose-designed drive for opening and planetary gearbox closing swinging-air flow vents in Venlo-type greenhouses. The combination of TR251/46 gear rack drive and aEP RW engine gearbox plays a part in an optimum greenhouse climate thanks to accurate positioning of the surroundings vents.
The self-supporting TR251/46 equipment rack drive comprises a zinc-plated C-profile with an integral compact equipment 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 gear rack drive, the drive torque is effectively converted into a maximum rack force of 4200 
N. Track rollers in the C-profile and guide blocks ensure stable extension and retraction of the rack. The drive shafts of the TR251/46 gear rack drive have lengthy, flat-sided journals. This makes it possible to suit drive shafts (prefab) installed with weld/sleeve couplings or chain couplings, after the house units have already 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 on request.