Fresh Air Intake

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Fresh Air Intake Dampers

Our Fresh Air Intake Dampers are more convenient than certain others types, since they run on gears in order to open and close. These gears may be attached to a motor, which makes the system entirely automated. This is less work for personnel in industrial settings, since the job of opening large dampers is left up to machines. A sensor that reads pressures and/or temperatures alerts the damper as to when and how it should adjust rather than relying on manual movement. They still require occasional checks, however, to ensure that they are working properly.

Applications

  • Low Leakage
  • Shut Off
  • Volume Control

Shape

  • Circular
  • Rectangular

Blade Operation

  • Opposed
  • Parallel

Frame

  • 16, 14, 12 gauge material
  • Alumunized, Galvanized, Stainless Steel, Other
  • 8″ Face to Face is typical
  • Punched or Blind Flange

Temperature Range (Materials Selected by Applications)

  • 70 – 1200° F
  • Galvanized 70° – 300° F
  • Aluminized 70° – 750° F
  • Stainless Steel 70° – 1150° F

Linkage

  • Mechanical: Plated A 36 Steel – 3/16″ x 1″ bar stock, crank arm welded to shaft

Shafts

  • Cadmium Plated 1036 Carbon Steel or 304/304L Cold Finish Stainless Steel – 1/2″ or 3/4″ diameter continuous full length
  • Zinc Plated 1018 Mild Steel

Bearings

  • Sintered Bronze Pressed in Frame (PIF)
  • Stainless Steel Pressed in Frame (PIF)
  • Bolted Flange Block Ball Bearing (Standard on Automatic Dampers)
  • Nitronic High Temp Bushing (Standard for Dampers above 900 F)

Extended Shafts

  • Less than 160° F not required
  • 160 – 1200° F Extended from Frame up to 8″

Blade Seals

  • Vinyl (low temp) or Stainless Steel (high temp)
  • Jamb Seals (Stainless Steel)

Shaft Seals

  • Adjustable Grafoil Packing Gland integral with frame
  • Outboard for Extended Shafts
  • Low Temp Neoprene Wiper Type Gasket (for automated dampers)

Manual Actuators

  • Hand Locking Quadrant
  • Worm Gear

Automatic Actuators

  • Electric (Open/Closed or Modulating 1-10/4-20 mA)
  • Operators: 24-220 1ΦAC; 220-440 3ΦAC
    • Spring Return
    • Electronic Failsafe
    • NEMA 4 – NEMA 6/7
  • Pneumatic (Open/Closed or Modulating 3-15 PSI)
  • Operators: Rack & Pinion, Vane, Linear, Diaphragm
    • Double Acting
    • Spring Return
 
 

Verification