Creactive Design invented a multivane vent to help increase the air flow through London Underground carriages. The vent was designed to fit into the upper section of a modified carriage window. Creactive Design manufactured prototypes and ran trials on a test train. The vent proved to significantly increase air change rates and velocities compared to an unmodified control carriage.

Three versions of the vent were installed in several combinations to evaluate the effectiveness of the different airflow patterns they induced through the carriage.

Trials showed the design could be successfully implemented in a carriage installation.