Ventiflex Duo


Protan Ventiflex Duo is a concept developed to transport air through narrow passages or in tunnels with restricted height, without compromising air flow.

A large main duct is replaced with two standard ducts with a smaller diameter, together called a duoduct. The duoduct is installed by means of a common wire suspension, and the two parallel ducts press against the roof when they are full of air. The roof height thus increaseds by up to 40% as compared with one main duct.

Lower energy usage

Protan Ventiflex Duo has a larger cross-section than other similar systems, which means lower energy consumption for the same installation height and fan output. It also delivers more air with the same fan output.

Two independent ducts

The two separate ducts can function independently, and the system’s secure coupling has extremely low friction. The Protan Ventiflex Duo concept has been developed in such a way that it can use all Protan couplings. In addition, it can be installed near the roof of a tunnel because the suspension system is place between the two independent ducts.

Get in touch

Pål Fossum - Sales Director - Tunnel & Mining

Pål Fossum

Sales Director - Tunnel & Mining
Arndt Hedtkamp - Sales Manager - Central Europe

Arndt Hedtkamp

Sales Manager - Central Europe
Ricardo Ortiz - Sales Manager Spain, Portugal and South America

Ricardo Ortiz

Sales Manager Spain, Portugal and South America