/, Contextual, Heating, HVAC, Operators, Physical environmental, Psychological, Short term/1.2.20 Installation of dampers on flue gas ducts

1.2.20 Installation of dampers on flue gas ducts

1.2.20 Installation of dampers on flue gas ducts



A flue damper is a cast iron plate with a spindle fitted inside the first piece of flue pipe that connects to the cast iron multifuel or woodburning stove. It works as a butterfly valve. The loss of energy due to room air spillage via the chimney to the outside can be avoided with flue dampers.


  • It can save more than 4000 kWh per year depending on the combustion heating appliance and the outside conditions

  • Reduce losses when combustion heating appliance is switched off


  • Prevent heated room air from escaping via the chimney


  • Prevent loss of heat stored in the stove

  • Prevent flue-gas back-flow

  • Reduce fuel consumption


  • High leakage


  • Blade flutter

  • Tendency of the blade to warp

  • Large clearance needs for the open blade

Economic assessment

The costs of the installation can be quickly recouped by the energy and fuel savings produced. The payback periods which are calculated according to the flue damper, location and chimney diameter are between 1.5-3 years.

References and best practices

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Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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