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Convincing benefits

Find out more about the special advantages that make the VENTAFLEX® ventilation system so powerful, efficient and economical.

Insulation/Heat protection


Comparison of structure and insulation


Comparison of thermal conductivity


Exemplary calculation for heat loss:

Diameter: DN500/600
Insulation: 50 mm
Area: 18.84 m²
Duct length: 10 m
Temperature difference: 30 K

Heat transfer coefficient:
VENTAFLEX® PUR rigid foam 0,022 W/mK
Spiral duct with mineral wool insulation 0,038 W/mK
Spiral duct with India-rubber insulation 0,040 W/mK

Heat loss =
Heat transfer coefficient x area x temperature difference / material thickness

VENTAFLEX® with PUR rigid foam insulation 249 W
Spiral duct with mineral wool insulation 430 W
Spiral duct with India-rubber insulation 453 W



VENTAFLEX® catalog 2021

VENTAFLEX® catalog 2021

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

Download pdf (8 MB)
Installation instruction VENTAFLEX® air duct round

Installation instruction 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 (737 KB)
Installation instruction VENTAFLEX® air duct for underground installation

Installation instruction VENTAFLEX® air duct for underground installation

  •  Recommended measures for installation

  • Application VentaSnap + adhesion

  • Length adjustment of air ducts

  • Creation of a wall duct

  • Installation wall collar

Download pdf (2 MB)


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