Model 3100 Counterbalanced Backdraft Damper

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STANDARD SPECIFICATIONS
  • FRAME:  14 ga. press formed steel.
  • BLADES:  .080 aluminum with press formed "V" reinforcements.
  • ADJUSTABLE WEIGHTS:  1 1/2" diameter plated steel washers on slotted aluminum brackets; maximum 2 brackets per section.
  • COUNTERWEIGHTS:  1/4" x 1 1/4" galvanized steel bars.
  • AXLES:  1/2" dia. x 2" C1018 plated steel steel.
  • BEARINGS:  1/2" I.D. ball bearings.
  • LINKAGE:  .063 semi-hard aluminum center brackets and 1/4" dia. plated C1018 steel rod.
  • CONSTRUCTION:  Welded frame and riveted hardware.
  • FINISH:  Standard Mill.
  • MAXIMUM SIZE:  48" x 48"
  • MINIMUM SIZE:  6" x 8"
  • MAX. STATIC PRESSURE:  4" w.g.
  • MAX. TEMP:  250°F
OPTIONS
  • -06  Blade Edge Seals (Dual Durometer Rubber-Max. 200°F)
  • -12  Nylon Bearings
  • -31  31. Flange, 1 1/2" fastened to damper frame
  • -86  Aluminum Frame Construction
  • -87  Stainless Steel Construction
  • -89  Sleeve
  • -95  Finishing

NOTES
  1. Dampers are counterbalanced to open at approximately 1/8" static pressure water gauge.
  2. A and B are opening dimensions. Unless otherwise specified dampers are made 1/4" undersize
  3. If "B" dimension is 14" or less, unit is constructed with a single blade.
  4. "A" dimension is width of damper measured parallel to the blades
  5. Maximum velocity 1500 FPM.
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