Fire Smoke Damper

UL555 Certified Fire Smoke Damper model FSD-311 is a high performance combination fire smoke damper with Class I leakage with 1 1/2 hrs fire resistance rating. High strength airfoil blades ensure the lowest resistance to airflow in HVAC systems with velocities to 4000 fpm (20.3 m/s) and pressures to 8 in. wg (2 kPa).

FSD-311 is available with high performance, fast acting spring return electric actuator / motor with fail-safe function and auxiliary switch for position indication. Actuator can be offered with 24V AC / DC or 230V AC power supply option.

Model FSD-311 may be installed vertically (with blades running horizontal) or horizontally and is rated for airflow and leakage in either direction.

Model FSD-311 meets the requirements for fire dampers, smoke dampers and combination fire smoke dampers established by:

• National Fire Protection Association NFPA Standards 80, 90A, 92A, 92B, 101 & 105
• IBC International Building Codes
• New York City (MEA listing #260-91-M)
• CSFM California State Fire Marshal
  • Fire Damper Listing (#3225-0981:103)
  • Leakage (Smoke) Damper Listing (#3230-0981:104)

• UL 555 Fire Resistance Rating
  • Fire Rating: 11⁄2 hours
• Dynamic Closure Rating: Actual ratings are size dependent
  • Velocity: Up to 4,000 fpm (20.3 m/s)
  • Pressure: Up to 8 in. wg (2 kPa)
• UL 555S Leakage Rating
• Leakage Class: I
  • Operational Rating: Actual ratings are size dependent
  • Velocity: Up to 4,000 fpm (20.3 m/s)
  • Pressure: Up to 8 in. wg (2 kPa)
  • Temperature: Up to 350°F (177°C) – depending upon the actuator
• Frame Material : Galvanized steel
• Frame Material Thickness : 16 ga. (1.5mm)
• Blade Material: Galvanized steel
• Blade Material Thickness: 14 ga. (2mm) equivalent
• Blade Type : Airfoil
• Linkage : Plated steel out of airstream, concealed in jamb
• Axle Bearings : 304SS
• Axle Material: Plated steel
• Blade Seals: Silicone
• Jamb Seals : 304SS
• Closure Device : RRL, Optional: RRL/OCI, TOR
• Closure Temperature: 165°F (74°C)

• Enclosed / Basement air and smoke ventilation
• Smoke / Fire Curtain, Zoning
• Building fire separation