EFS Dynamic Fire Damper 3 hr rating

EFS Dynamic Fire Damper 3 hr rating


EFS Multi-Blade fire damper is rated as a 3 hours fire damper for use in dynamic systems, per SI 1001 part 3 (UL 555).


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 or power failure conditions.


EFS dynamic Fire damper provides a low pressure drop design, qualified to 2,000 ft/min 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.

order inquiry

  • approved for 3 hr
  • 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
  • Resettablel thermostat: 165°F, 212°F, 250°F or 350°F
  • Electric actuator 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 10o1 part 3 (Underwriters Laboratories, Inc. – UL Standard 555)
  • 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


Related Products


Design Studio Bahir