TPI SPECIALTY POLE MOUNT FANS 24" Non-Oscillating Single Phase Explosion Proof These quality fans include an enclosed permanently lubricated, PSC-type ball bearing motor for long life and optimum performance. 3 quiet aluminum blades are enclosed in double locking steel wire guards for safety. Pivot-action fan head allows vertical tilt angle adjustments. Pole mount attaches to 4", 6" or 8" poles with U-Bolts (not included). Meets OSHA standards, UL listed. Includes a junction box for hard wiring. Explosion Proof Models are unassembled and features Class I and II protection for flammable and carbon dust environment protection. Horsepower rating based upon maximum speed/load.