Vent Controller Versatile Vent Control Versatile Vent Control Operates any motorized greenhouse vent-roll-up or retractable roof system incrementally. Versatile Vent Modes of Operation Choose this control if you have a computerized control, a STEP 50, STEP 500. see diagram above) If you do not have an environmental control and are using thermostats order the Versatile Vent Complete Package. Opens proportionally with a computerized control like an EnviroSTEP, VersiSTEP or microSTEP/SA computer controls. It can be used with any computer control for proportional vent movement. Opens in increments, closed, 1/4 , 1/2 and full open when used with STEP50, STEP500, M-1608. Opens in increments, closed, 1/4 , 1/2 and full open when you order the Versatile Vent Complete Package Works best with internal limit switches. We will continue to offer the full line of controls which includes increments with computer controls (LST) or open in increments with staged controls (Incremental). We have controls with internal (ILS) or external limit switches. Features: LED display of current temperature and vent position Manual overrides Alarm output: Programmable high and low temperatures Fahrenheit or Centigrade selectable NEMA 4X cabinet – plastic 12″ x 8″ x 7″ with lockable latch. Protects against sunlight and moisture in the greenhouse environment.