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About Dampers : GUILLOTINE VERSUS DOUBLE LOUVERS

Guillotine VS Double Louvers:

Guillotine Dampers

Advantages: 

  • Tighter sealing than double louvers.  This means a smaller seal air fan can be used which will result in a cost savings due to lower operating power requirements.. Fan horsepower in only 10-20% of double louvers.
  • Shorter flange to flange dimension.  The damper also operates completely within the Guillotine flange to flange dimension.
  • Seal Air System can be tested while the system is on-line.  This assures all seals are working.  This can not be done with double louvers.
  • Lower operational and maintenance costs.

Disadvantages:

  • Clearance is required above, below or to one side of the duct for the drive frame.
  • Not recommended for flow modulation.
  • Additional structural supports required.

Double Louver Damper

Advantages:

  • Can be used for flow modulation in addition to tight shutoff.
  • Minimal clearance required outside the duct.

 

Disadvantages:

  • Longer flange to flange dimension is required and clearance is required in the duct adjacent to the flanges.
  • Higher operation costs due to larger seal air fans.

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