The “Seats” are the surfaces against which damper blades make contact when in the closed position. Proper seat selection is critical to sealing performance, longevity, and overall reliability of the damper. In some applications, providing adjustability in the blade seats can be beneficial. This allows for fine-tuning of the contact pressure between the blades and seats to optimize sealing performance. The choice depends on the systems characteristics and the nature of the process.

Typical seat configurations include Fixed or Adjustable; Swing, Step, Tadpole, Scissor, or Knife Edge arrangements. Other configurations and additional features are available.