* Develop concept, preliminary, and detailed designs for ECS and TVS systems for metro rail and tunnel projects. 

* Perform ventilation and smoke control calculations, including airflow, heat loads, piston effect, and emergency operation scenarios. 

* Design and size supply, exhaust, smoke extraction systems, fans, dampers, silencers, shafts, louvers, and associated ductwork. 

* Carry out and review CFD simulations for normal and emergency ventilation using tools such as IDA Tunnel, SES, FDS. 

* Interpret CFD results to validate system performance and support design optimization and safety compliance. 

* Prepare and review system layouts, schematics, single-line diagrams, and P&IDs for ECS and TVS systems. 

* Coordinate with Civil, Architectural, Electrical, Fire, ELV, BIM, and other systemwide contractors to ensure integrated designs. 

* Ensure designs comply with applicable standards such as NFPA 130, ASHRAE, ISHRAE, NBC, and project speci...