This High Pressure Exhaust Fan removes fumes, dust and smoke. Direct driven exhaust fan is ideal for mills, mines, foundries & factories. Fan blades are made of heavy duty one-piece cast aluminum to provide spark-free operation. Frame is made of heavy duty steel venturi that is completely arc welded with tubular supports. Exhaust fan features explosion proof ball bearing motor. Gray enamel finish. Three phase design. Horsepower rating based upon maximum speed/load.