iO HVAC Controls RM-14 Rheem 14" Round Zone Damper, 35 Second Belimo ActuatoriO HVAC Controls RM 14 Rheem 14" Round Zone Damper, 35 second Belimo actuator Description iO HVAC Controls offers a wide selection of in stock round and rectangular dampers that are compatible with the Rheem Ruud EcoNet zone control systems. We offer more sizes, better pricing and same day shipping. Also compatible with our ESP zone control panels and kits. Features and Benefits Compatible with Rheem Ruud EcoNet zone systems Two position 24V motor;