iO HVAC Controls MD-3608 36" X 08" Rectangular 2 Position Zone Damper - Belimo 3 Wire ActuatoriO HVAC Controls MD 3608 ACTUATORS ARE INSTALLED ON 2ND DIMENSION 36" x 08" Rectangular 2 Position Zone Damper Belimo 3 Wire Actuator 36" x 8" Rectangular 2 Position Zone Damper Belimo 3 Wire Actuator, PO PC, 60 Second Actuator timing, 2. 5 VA, 24V For use with the iO ESP Zone Panels or any zone panels needing 3 wire dampers 5 YEAR WARRANTY Additional Information Item NumberMD 3608 BrandiO HVAC Controls