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Nursery Les Ulis

Nursery Les Ulis

The air duct systems of the building were tested on tightness well after the delivery of the new construction. The test results showed that the system were considerably leaky and that tightness targets could not be met (2-3 x tightness class A instead of tightness class B). The primary challenge of this project was that the air duct systems are located behind a suspended ceiling that is not demountable. Therefore, access was really limited and company SOGESTFA was contacted to seal the ducts from the inside using MEZ-AEROSEAL.


Building: Nursery "Les Ulis"
City: Essonne, France
Date: 24 November 2015
Target: Achievement of air tightness class B
Preseal leakage: Average of 130,5 l/s
Postseal leakage: Average of 9,8 l/s
Reduction of leakage: Average of 92,3%


The project was carried out within 3 days, including preparation, sealing and dismantling of the duct work and the MEZ-AEROSEAL equipment. The sealed duct work sections have surfaces from 60 to 80 m2 and lengths of 50 to 70 m. In total 7 injections were realized to seal the entire system. The system is constituted of rectangular and circular sections. The air terminal devices are connected with flexible ducts with acoustic insulation.

The customer was the muniicpality of Les Ulis. The customer was very pleased that the air tightness target could be met and even exceeded, about the short project term, and that the total project cost was well below the costs of a complete dismantling of the ceiling and a traditional, manual sealing of the duct work.