Large scale dust extraction where the booth is capable of housing a complete underground train (140 metres).

Turnkey projects such as this 140 metre long dust extraction tunnel are a Harmill speciality. This project was taken from inception through design and build to final commissioning and handover. Dust is generated when servicing the traction motors and carriage ventilation systems, and is collected in the air stream which is drawn down the length of the enclosure by the 110 kW fan outside the building.

Dust is separated in the four banks of reverse jet filters containing 240 separate filter cartridges. A sophisticated control system monitors the operative’s environment and ensures that dust levels are always kept at safe levels. The main fan is inverter controlled to ensure optimum performance and minimum energy costs.