CU-LT-L500 - Optimised rectangular fire damper up to 120’

CU-LT damper with a tunnel casing extension at the wall side to facilitate the connection to the duct when the supporting construction is thicker than 100 mm.


  • Easy to install
  • Optimal free air passage and minimal pressure loss
  • Optimal acoustic performance
  • Higher net building volume through compact size
  • Air-tightness class ATC 3 according to EN1751 (formerly C)


  • Hygiene certificate (
  • Suitable for built-in installation
  • Suitable for installation remote from the wall
  • Minimal distance allowed
  • Suitable for installation in rigid wall, rigid floor, flexible wall and flexible shaft wall (metal stud gypsum plasterboard wall)
  • Sealing with fire resistant stone wool boards allowed, also for asymmetric opening
  • Tested according to EN 1366-2 up to 500 Pa
  • Operating mechanism outside the wall
  • Maintenance-free
  • For indoor use
  • Intermediate dimensions on request
  • Operating temperature: max. 50°C


  1. Casing in galvanised steel
  2. Damper blade
  3. Operating mechanism
  4. Sealing cold smoke
  5. Intumescent strip
  6. Positioning plate
  7. Connection flange PG20
  8. Product identification