Stack Dampers

DTL stack Dampers are designed to minimise heat loss from your boiler and to prevent the ingress of rain water, our range of stack isolating dampers are designed for use with stacks from 300mm diameter up to more than 10000 mm.

DTL’s stack isolating damper can be either a butterfly or multilouvre design and can incorporate an automatic pressure relieving system to prevent over pressurisation and damage to the HRSG and gas turbine.

DTL Stack Dampers can be manufactured in Carbon Steel or Stainless steel, however for special applications we can utilise any material to suit your requirements such as 800HT, 310S, Alloy 31, Alloy 59…

Stack damper

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Typical Applications

  • Exhaust Stacks


Technical Specifications

  • Pressure: Typically 50Kpa (0.5 barG) Higher on request
  • Temperature: Typically 600°C (1112°F) up to 1250°C (2282°F) on request


  • Round or rectangular design
  • Fully welded body
  • Specially engineered compact design
  • On/off or modulating
  • Pressure relieving
  • Typical range from DN300 to DN10000 (other sizes available on request)
  • Electrically actuated (Pneumatic actuators also available on request)

Optional Extras

  • Pneumatic cabinet
  • Maintenance free bearings
  • Rain Channels
  • End connections: Flanged to fit ANSI, EN, JIS standards

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