By July 31, 2010, the installation and commissioning of 15 ventilation units between S1 station and U1 station of the Northern Extension of Tehran Metro Line 1 Project had been completed ahead of schedule and put into business operation after being transferred to the client, which won praises from the client. The business operation of the ventilation units would effectively improve the environment of the stations.
Meanwhile, another 15 units of ventilation system in Tehran Metro Line 1 Project, contracted by CITIC Construction, is about to apply for PAC after the comprehensive commissioning this August. The Ventilation is another system applying for PAC besides the Escalator, the Communication Signal and High Volte Power Station, which will lay down a good foundation for the subsequent installation and commissioning.