surface main fan

Surface main fans are positioned at mine shaft collars or tunnel portals to force fresh air into underground workings or enclosed passages. They establish the pressure differential required to circulate air through intake and return circuits.

These large-capacity fans, often axial flow, deliver 100,000 to 500,000 CFM against static pressures up to 6 kPa. Heavy-gauge steel casings and high-strength impeller blades ensure durability under continuous operation.

Integrated with VFD drives and environmental sensors, surface main fans support constant-pressure control, automatically adjusting speed to maintain target airflow despite changing underground resistance. Explosion-proof and weather-resistant enclosures protect motors and controls.

Routine maintenance is facilitated by split-casing designs, remote condition monitoring for vibration and temperature, and quick-release access covers, making surface main fans the cornerstone of safe, efficient mine and tunnel ventilation.