Control Dampers

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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.

It is easy to install and seal, becomes part of the ductwork and offers an economical alternative to a "shop built" damper



  • FRAME 20 gauge (.91) galvanized steel, 6" (152) wide.
  • BLADES 20 gauge (.91) galvanized steel.
  • CONTROL SHAFT/HAND QUADRANT 3/8" (10) square axle shaft extending beyond frame through factory mounted, locking hand quadrant.
  • BEARINGS Molded synthetic.
  • FINISH Mill galvanized.
  • MAXIMUM VELOCITY 1500 fpm. (457 m/min.)
  • DAMPER SIZES 4", 5", 6", 7", 8", 9", 10", 12", 14", 16", 18" and 20" (102, 127, 152, 178, 203, 229, 254, 305, 356, 406, 457, and 508) diameters
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