FS Series Fire/Smoke Damper
Product Features:
  • Fire rated for 1-1/2 hours (UL-555)
  • Leakage rated as Class I, II, III or IV (UL 555S)
  • Temperature rated at 250-degrees F or 350-degrees F (UL555S)
  • Provided with a galvanized steel sleeve
  • Qualified electric or pneumatic actuators
  • Patented Pneumatic Emergency Relief Valve (P.E.R.V.) feature on standard pneumatic models
Optional Product Features:
  • "Sens-O-Therm" Thermally Reopenable Temperature Sensing System
  • Dual position indicator package
  • 24 Volt electric actuators
  • Type "C" housing for round or oval ductwork
  • Heavy duty sleeve thicknesses
  • Longer sleeve lengths
  • 212-degree F thermal disc (electric models) or fusible link (pneumatic models)

New! Integral Sleeve Design (Alternate)
ABI is pleased to produce another industry first:
Combination Fire/Smoke Dampers with an Integral Sleeve.

The advantages of this boldly unique design are numerous:

  • A constant blade stop height of 3/4" for maximum pressure drop
  • A single blade (max. 24" x 16") for maximum free area
  • Shorter sleeve protrusion on the actuator side (by 3")
  • Reduced size actuator envelope dimensions
  • An inexpensive 24 VAC, 250-degree F Multi-Products actuator
  • An inexpensive 120 VAC, 350-degree F Multi-Products actuator
  • Dual direction air flow
  • Invertability - If the installation site requires the actuator to be on the other side, just turn it over!
  • Lighter (about 15%) and easier to install
UL STANDARD FOR SAFETY 555S LEAKAGE RATED DAMPERS FOR USE IN SMOKE CONTROL SYSTEMS
All FS Series Fire/Smoke Damper/Actuator Assembly Models have successfully passed the rigorous tests required for all UL 555S rated products. Underwriters Laboratories requires that all UL 555S rated dampers be accompanied with their matching UL approved, factory supplied actuators.
UL 555S Ratings
Leakage *Max. Leakage at
Class 1 in. wg. 4 in. wg.
I 4 8
II 10 20
III 40 80
IV 60 120
California State Fire Marshal
 #3230-1328:108 (FS I & II)
#3225-1328:108 (FS III & IV)