Belimo FSNF24-S Fire and Smoke Damper Actuator 24V 350°F

The Belimo FSNF24-S is a spring return fire and smoke damper actuator designed for life safety applications in commercial HVAC systems. This UL-certified actuator provides reliable failsafe operation for fire and smoke dampers, automatically closing dampers in the event of fire to prevent smoke migration through ductwork.

Key Features:

• 24VAC/DC power supply with low power consumption
• 350°F (177°C) high-temperature rating for fire-rated applications
• Spring return mechanism ensures failsafe damper closure during power loss or fire conditions
• Auxiliary switch for damper position indication and remote monitoring
• Direct-coupled mounting for quick installation on fire and smoke dampers
• Includes manual override for testing and maintenance
• UL listed for dynamic and static fire/smoke damper systems
• Weatherproof NEMA 4/4X (IP54) enclosure for demanding environments

This actuator is engineered for use with both round and rectangular fire/smoke dampers in air handling systems. The integrated auxiliary switch provides end-of-stroke confirmation for building automation systems and alarm monitoring. Belimo's proven spring return design delivers consistent torque throughout the operating range, ensuring reliable damper positioning even in high-temperature emergency conditions.