iO HVAC Controls CD-2820-BM 28 X 20 Carrier/Bryant Rectangular Zone Damper - Belimo 3 Wire Actuator - Bottom MountiO HVAC Controls CD 2820 BM ACTUATORS ARE INSTALLED ON 2ND DIMENSION 28 x 20 Carrier Bryant Rectangular Zone Damper Belimo 3 Wire Actuator Bottom Mount 28 x 20 Carrier Bryant Compatible Zone Damper Bottom Mount Belimo 3 wire 15 second actuator, compatible with Carrier Infinity and Bryant Evolution Systems, 24V Actuator 10 YEAR WARRANTY Additional Information Item NumberCD 2820 BM BrandiO HVAC Controls