underground main fan

Underground main fans are installed below surface—often in intermediate shaft stations or cavernous headings—to directly supply or exhaust air within the mine’s subsurface network. This design reduces ducting complexity and improves control of airflow paths.

These fans deliver up to 300,000 CFM at static pressures up to 5 kPa, with rugged steel casings and sealed flameproof motor enclosures suited to moist and dusty underground conditions. Impellers are dynamically balanced for minimal vibration.

Variable frequency drives (VFDs) permit constant-pressure control, automatically adjusting fan speed based on sensor feedback from remote gas, temperature, and airflow monitoring devices. Explosion-proof ratings ensure safe operation in methane-rich atmospheres.

Maintenance access is simplified via split-casing construction and external bearing lubrication points. Underground main fans provide a reliable, compact solution for deep-level mine ventilation.