Tandem Louver Dampers

  • Unique dual skin, truss blade assembly to eliminate the need for two sets of bearings/packings/etc.
  • 100% isolation using supplied seal air system
  • Flex-Ledge seals offers tight shut off with low pressure drop, and can operate in high dust load applications.
  • Many different actuator options to fit customer’s operating requirements.
  • Applications requiring 100% isolation where a guillotine is not practical due to space constraints.
  • Applications requiring 100% isolation where fast operation or fail-safe modes are required.
Operating Range
  • 0-3 psig depending on size
  • -100 to 1400°F
  • Sizes from 12” > 40’
  • Horizontal or vertical
  • Carbon Steel
  • Stainless Steel
  • Nickel Alloys
Tandem Louver Fit:
  • Attached or linked to piping/duct flanges or directly to duct.
  • Flange connections may be alignment bolted and seal welded into the duct, or provided with bolt and gasket type connections.
  • Tandem louver dampers typically require between 36”-48” of duct space for installation.
Tandem Louver Form:
  • Flex-Ledge Tandem louvers are used for 100% isolation of ductwork.
Tandem Louver Function:
  • Open/close applications where tight shutoff is mandatory.
  • Often 100% isolation required with seal air systems
  • Provides “man-safe” isolation of equipment for online maintenance
  • Allows for “fast acting” operation (<20 seconds) for emergency bypass applications.