Wadsworth Control Systems Inc. products

Flexible and powerful, the VersiSTEP multi-zone greenhouse controller gives you the ability to divide its 24 outputs any way you’d like between one and eight zones. This is the perfect control for greenhouses with more equipment than will fit on an EnviroSTEP control or for growers with multiple zones.

The rack and pinion connects the vent to the drive unit shaft.  As the drive unit turns the shaft, the rack pushes the vent open or pulls it closed.