logo ruskin 60px


Fire/Smoke Damper, Steel, 1½ Hour Rating, UL555/UL555S Classified, Class III, Vee-Groove Blade, w/Integral Sleeve for Grille


  • Factory designed to accept a 1 3/4" grille and 3/4" front flange shipped loose.
  • Triple V-Groove Blades.
  • Rated to 2,000 fpm and 4" w.g.
  • UL approval for dual directional airflow.
  • Failsafe design, which enables the damper to automatically assume the desired position when fire or smoke (if smoke detector is present) interrupts operational power.
  • The EFL or PFL heat-actuated release devices permit controlled closure through the actuator and are automatically remote resettable after test, smoke detection, or power failure conditions.
  • Galvanized steel construction.
  • Note: Consult Ruskin if wall is less than 6" thick.

Additional Info

  • Blade Type: Vee-Groove
  • Rating: 1-1/2 Hours
  • AMCA Certified: No
  • Modulating: No
  • Grille Access: Yes
  • Explosion Proof: No
  • Leakage Class: Class III

Related items

  • MDRS25 MDRS25

    The MDRS25 is a ruggedly built round manual balancing damper with factory mounted, locking hand quadrant designed especially for manual balancing applications within round spiral ductwork.

  • MD35 MD35
    The MD35 Manual Balancing Damper has a 5" frame.
  • MD25 MD25
    The MD25 Manual Balancing Damper has a 3" frame.
  • MD15 MD15
    The MD15 is a ruggedly built, inexpensive damper with stand-off bracket for the hand quadrant both factory furnished. It is designed for manual balancing applications with rectangular ductwork. 
    The ELM90 Adjustable Louver is 6" deep and has a 37 1/2 degree blade angle.
More in this category: « FSD60V FSD35GA »

Air Delivery

Life Safety

Air Measuring

  • AML3
    AML3 The AML3 is a unique product that combines a wind driven rain resistant louver with an air measuring station in…
    in Air Measuring Products

More Control

  • Humidity Sensor
    Humidity Sensor The HU-224/225 is an extremely fast, stable and accurate humidity transducer designed for harsh environments. The polymer capacitance sensor is…
    in Humidity

Proudly Representing

logo ruskin 60px logo nailor 60pxh ACME Logo Air Concepts FlexmasterLogo

InetSupervisor thermal header Engineered Comfort Mamac Logo