Vent Controllers Vent Controllers Wadsworth is your complete source for vent automation. We know that growers want an integrated vent system that ensures quality in every part and that’s why we provide: Gear motors that are strong, durable and long lasting. Vent controls that work with any environmental control system from a thermostat to a state of the art computer like our EnviroSTEP. Strong, corrosion free racks with precision cut teeth. Zinc pinion gears with precise spacing and an outer raised shoulder that extends the life of the rack & pinion. Wide housing that allows racks to work even when the rack is not perfectly aligned. Universal shaft hangers made of rugged 12-guage galvanized steel complete with nylatron bushings. Vent Controller Selection Steps What size gear motor? What size shaft? What type of vent controller? What length of rack?