The air ducts comprise a “sandwich construction” with high insulated polyurethane rigid foam at the core. The external and internal surfaces are from a resistant GRP coating. The smooth dirt-repelling surface is easy to clean and UV stabilised.

The pipes are available in lengths of 1.0 m or 1.5 m. This results in less bonded joints and therefore shorter assembly times.


  • Good insulation – for the avoidance of
    condensate forming (look picture
    “comparison condensate forming”)
  • Heat conductivity = 0.022 W/mK
  • Sound reduction up to 5 dB(A)
  • DLG-tested system (DLG test report 4895)
  • High air flow: look at fresh air distributor ZLV

Technical data:

Diameter: 520 to 1,090 mm

Colours: Light grey, brown


Infosheet Download

DLG test report Download

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