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Inlet Box Louvre Dampers: Pre-Spin and Opposed Blade
Both types of inlet box dampers differ from the IVC in that the bearings are outside the airstream, allowing higher temperatures and dust laden applications.
Product Bulletin: ID100
Pre-Spin Dampers
  • Alter fan performance by moving down the system curve
  • Double surfaced blades welded to full length axles and operate parallel to each other to pre-spin the air
Opposed Blade Dampers
  • Blades provide a straight flow of air towards the fan
  • Typically used in Boiler applications
  • Located above a mixing box in front of the fan inlet
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