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Advantage: Insulation/thermal protection


Structure and thermal insulation of duct types by comparison

VENTAFLEX air duct insulated

No corrosion:
visually appealing and durable

Conventional duct

Vulnerable für corrosion:
therefore quickly unsightly and defective


Thermal conductivity by comparison

VENTAFLEX air duct insulated

Above average high insulation value WLS 022 – almost no thermal loss, no condensate formation

Conventional duct

High thermal losses –
the result is condensate formation


VENTAFLEX air duct: good insulation is visible on the thermal image!


Sample calculation thermal loss:

Diameter: 520 mm
Insulation: 50 mm
Surface: 18,84 m²
Duct length: 10 m
Temperature difference: 30 K


PUR rigid foam insulation
Spiral duct mineral
wool insulation
Spiral duct
rubber insulation
Thermal transmission coefficient:0,022 W/mK0,038 W/mK0,040 W/mK
Thermal loss249 W430 W453 W

Thermal loss = Thermal transmission coefficient x surface x temperature difference/ material thickness


At a glance

Structure of the material, insulation and thermal transmission value.


Download comparison of VENTAFLEX with conventional duct

Download topic heat permeability



VENTAFLEX catalog 2022

VENTAFLEX catalog 2022

All air duct products, technical details, supplies and installation instructions can be found in our general catalog.

Download pdf (17 MB)
Installation VENTAFLEX air duct round

Installation VENTAFLEX air duct round

  • Installation of VENTAFLEX air ducts with VENTASNAP and VENTAFIX
  • Glueing of VENTAFLEX air ducts
  • Installation of a compensator for the expansion compensation
Download pdf (742 KB)
Installation LAVANTUS air duct for underground

Installation LAVANTUS air duct for underground

  • Laying the air ducts
  • Length adjustment of air ducts

  • Installation LAVANTUS ring seal

  • Installation LavantusGrip

Download pdf (4 MB)


The change in energy policies demands a different technology

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Underground installed air ducts for comfortably temperated air in the event hall of the listed Liebfrauen church

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LAVANTUS – the air duct especially for underground installation

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With immediate effect LAVANTUS is only used for underground and VENTAFLEX classic only for aboveground installation!

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