Forcing-type fans generate positive pressure to supply fresh air into enclosed areas—such as building interiors, tunnels, or underground workings—pushing out contaminants and maintaining airflow circulation.
Axial and centrifugal models deliver 5,000–200,000 CFM at pressures up to 6 kPa. Their rugged housings and balanced impellers support continuous, high-pressure operation.
Variable frequency drives (VFDs) provide adaptive pressure control, adjusting speed to maintain target supply air pressure despite changes in duct resistance or demand.
Maintenance features include split-casing impeller access, external grease fittings, and integrated condition monitoring. Forcing-type fans support fresh air makeup, pressurization, and safe refuge environments.