SEMA design and produce ventilation ducting for tunnels and underground works for more than 50 years. Thanks to its modern and efficient production plant, its experience and reactivity, SEMA is offering a wide range of ventube:

•    Flexible flat ducting: diameter from 200 up to 3000mm. Length until 200m
•    Spiral ducting: diameter from 200 up to 2200mm. Length until 20m
•    Wide range a fabric (fire retardant treated, antistatic, insulant, ATEX).

SEMA’s expertise in aeraulic allows them to give a proper answer to all kind of yard’s request worldwide.

The cassette & cartridge patented system offers an easiest and fasted service of the duct delivery and set up, and saves tunnel boring downtime.

Several options such as fire protection patented system, hammock for small diameter tunnel offers a large flexibility in configuration.

A large equipment choice like integrated or separated closure system, flexible angled connexion, structural reinforcement, allows to set up the best technical solution.

SEMA is the indispensable partner for the ventilation, offering innovative solution, allowing higher flexibility as well as major productivity gains.