Flap Damper

Flap dampers can be applied in various configurations depending on the individual plant requirements.  Toggle arm as well as pivot-driven designs are available.


  • Duct isolation for process or maintenance reasons



  • Process industries, FGD, SCR and GT plants


  • Very low pressure drop due to the possibility of positioning the blade out of the gas stream when damper is fully open
  • Large blades with reduced sealing length and very low leakage
  • 100 % gas tight with seal air
  • Insulated blade to reduce heat radiation
  • Flap can replace two separate (louver) dampers, depending on the duct configuration



Size: up to 100 m²
Temperature: up to 670 °C
Pressure: up to 100 mbar
Materials: carbon steels, stainless steels
Actuation: electric, pneumatic or hydraulic
Insulation: internal, external