EFS Combination Fire and Smoke Damper, 3 hr rating, Class 1

EFS Combination Fire and Smoke Damper, 3 hr rating, Class 1


EFS Multi-Blade Combination fire and smoke damper is rated as a 3 hour fire damper and a Leakage Class I Smoke damper for up to 350°F. For use in dynamic systems, per SI 1001 part 3 (UL 555) and SI 1001 part 4 (UL 555S).


As a life safety fire damper, it has a failsafe design which enables the damper to automatically close upon the detection of heat and/or loss of power. The electric heat responsive device enables controlled closure through the actuator and is automatically remotely reset after testing, smoke detection, or power failure conditions.

EFS damper provides a low pressure drop design, qualified to 2,000 fpm (10.2 m/s) and 4.0 in. WC (1.0 kPa) and can be installed in vertical walls and partitions, or horizontally in floors or assemblies with fire resistance ratings up to 4 hours.

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  • Approved for 3 hr
  • Leakage Class I
  • 250°F or 350°F
  • Approved for Dynamic Conditions
  • Electric heat responsive device can be resettable (thermostat, not a mechanical fusible link)
  • Multiple section assemblies
  • Approved for Vertical and Horizontal mounting position
  • Resettable, single or dual thermostats : 165°F, 212°F, 250°F or 350°F
  • Electric actuators 24V, 120V or 230V : Belimo, Honeywell or Siemens
  • Actuators available internally or externally mounted
  • Position indication switches available as part of the electric actuator
  • Momentary Test Switch available
  • Factory supplied sleeves in various lengths and gauges
  • Frame retaining angles can be provided for easy and quick installation


  • SI 1001 part 3 (UL 555) and SI 1001 part 4 (UL 555S)
  • National Fire Protection Association (NFPA 80, NFPA 90A, NFPA 92, NFPA 101 and NFPA 105)
  • International Building Code (IBC)
  • ICC’s International Building Code
  • SMACNA requirements


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