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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



LAVANTUS – the air duct especially for underground installation

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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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The change in energy policies demands a different technology

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Projects where the client has the courage to realise new economic and ecological ideas are the "favourite challenges" of the VENTAFLEX team.

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VENTAFLEX Calalog 2023

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

• Installation of VENTAFLEX air ducts with VENTASNAP and VENTAFIX
• Glueing of VENTAFLEX air ducts
• Installation of a compensator for the expansion compensation

• Laying the air ducts
• Length adjustment of air ducts
• Installation LAVANTUS ring seal
• Installation LavantusGrip