iO HVAC Controls CD-2818 28 X 18 Carrier/Bryant Zone DamperiO HVAC Controls CD 2818 ACTUATORS ARE INSTALLED ON 2ND DIMENSION 28 x 18 Carrier Bryant Zone Damper 28 x 16 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 2818 BrandiO HVAC Controls