01/06/2026
Check out Roma Street's biggest fans - Our massive Tunnel Ventilation System (TVS) fans are officially undergoing intensive testing and commissioning.
To give you an idea... the team is carrying out a range of test scenarios across multiple locations throughout the tunnels and stations. This includes measuring airflow, pressure and fan performance, using equipment like ultrasonic wind speed and direction sensors providing accurate readings about production of air pressure and flow by the fans.
These huge fans will keep fresh air circulating through the tunnels and stations, but also need to be able to extract air efficiently in an emergency. They weigh around 4-6 tonnes, are about 2m in length, with a number of units installed across the stations and tunnels.
This is just one of thousands of critical pieces of equipment being rigorously tested before passengers can safely use the new underground stations 🚇 To learn more about all of the stages of testing and commissioning check the comments.