Butterfly Dampers

Butterfly Dampers - Flextech Industries

Flextech Industries' butterfly dampers are available for a variety of applications in round duct work where low leakage isolation, flow control or a combination of the two is desired. Flow characteristics are close to that of a single- blade louver. Varying degrees of isolation can be obtained from 90 to 99% depending on the seal arrangement.
Single and multi-blade designs provide low cost isolation and flow control of flue gases.

Four seal designs

  • Swing-through Seal: Ideal for dirty applications where tight shut-off is not required.
  • Step Seat: Suitable for relatively clean flue gas applications.
  • Tadpole Seal: For clean applications when tighter leakage rates are required.
  • Step Seat with Perimeter Seal: Designed for clean applications. It comes with an elastomeric perimeter seal on the blade.



  • Scrubber Systems
  • Stack isolation
  • Control air systems
  • Balancing systems
  • Incinerators
  • Baghouse



  • Low cost
  • Low maintenance
  • Excellent for isolation
  • Minimal outside space required for support structure
  • No leakage to ambient
  • Easy access to shaft seals

To learn more about our industrial butterfly dampers and their various applications, please contact Flextech today.