Belimo NFX24-SR-S N4 : Spring Return Damper Actuator, 24VAC/DC, 90 in-lb, 2-10VDC (4-20mA) Proportional Control Signal, <95 Seconds Run Time, <20 Second Spring Return, (2) SPDT 3A (0.5A Inductive) @ 250V Auxiliary Switches, NEMA 4/IP66 UL Enclosure Type 4, Damper Area up to 22 Sq.Ft., 5-Year Warranty (Configurable)