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Rotafusion Method – made in Germany



[Translate to English:] Ventaflex Rotafusionsverfahren

It’s high time for an innovation

Especially for air ducts for underground installation there are only a handful of convincing solutions on the market – often the ducts are used, which were originally designed for other applications. Compromises regarding handling, hygiene, insulation and finally costs are always planned.

The „regular product“ of VENTAFLEX, the pre-insulated VENTAFLEX air duct, has been a gladly used alternative to the common concrete- and plastic pipes.

In order to optimize the underground air transport further and to adapt the ducts even better to the underground environment, we decided to develope an entirely new product.


The result: patented and revolutionary

The LAVANTUS air duct for underground installation is the result of longstanding research- and development work, which was finally successful in the invention of the unique, patented Rotafusion Method.
In order to finally meet the requirements of an air duct for underground installation, VENTAFLEX built an unit specially made for this purpose and has been producing in Germany since then.

What exactly is happening in the ‚blue cube‘ stays …. a company secret!



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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