What type of vent control?

ILS / 2R - Internal limit switch - slave unit

Choose this control if you have an ILS/LST master control.

• Used with an ILS/LST master control movement follows the master unit.
• Opens proportionally if used with a computerized control like the EnviroSTEP.
• Opens in one movement and does not proportion if used with a staged control like the STEP 50.
• If the master control is placed in the center it can have six 2R units, 3 on each side.
• Internal limit switches.