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51CRVD/51CRHD 1-1/2 Hour Type CR (Round)

51CRVD/51CRHD 1-1/2 LABEL DYNAMIC FIRE DAMPERS are suitable for use in fire separations with a fire resistance rating of 2 hours or less, and are UL/ULC approved for use in HVAC systems where the fans remain on in the event of a fire.

DEPTH:  4 ¼“ (108). 

FRAME:  Roll formed 20 Ga. galvanized steel with hemmed edge. 

BLADES: Roll formed 22 Ga. galvanized steel.

              Interlocking curtain type blades. 

FUSIBLE LINK:  165°F (74 C).  


  • Factory supplied Sleeve – 22, 20, 18 or 16 Ga.(Sleeve length required).
  • Access Door factory mounted in a common sleeve
  • 212°F (100 C) Fusible Link
  •   1 ½” x 1 ½” "Quick-Fit" Retaining Angles