iO HVAC Controls CD-3420 34 X 20 Carrier/Bryant Rectangular Zone Damper - Belimo 3 Wire ActuatoriO HVAC Controls CD 3420 ACTUATORS ARE INSTALLED ON 2ND DIMENSION 34 x 20 Carrier Bryant Rectangular Zone Damper Belimo 3 Wire Actuator 34 x 20 Carrier Bryant Compatible Zone Damper Belimo 3 wire 15 second actuator, compatible with Carrier Infinity and Bryant Evolution Systems, 24V Actuator 10 YEAR WARRANTY Additional Information Item NumberCD 3420 BrandiO HVAC Controls