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POWER SUPPLY: TYPE FSLF SPRING-RETURN ACTUATOR IS INTENDED FOR OPERATION OF SMOKE AND COMBINATION FIRE AND SMOKE DAMPERS IN VENTILATION AND AIR-CONDITIONING SYSTEMS. ACTUATOR WILL MEET REQUIREMENTS OF UL555 AND UL555S WHEN TESTED AS AN ASSEMBLY WITH DAMPER AND WILL MEET REQUIREMENTS OF UBC FOR 15 SECOND OPENING AND CLOSING.