REPLACEMENT FAN HEADS Explosion Proof Hazardous Location Single Phase Fan Head These quality fans include an enclosed permanently lubricated, PSC-type ball bearing single-phase 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. Meets OSHA standards, UL listed. Replace or upgrade fan heads with industrial quality air circulator heads. Includes junction box for hard wiring. Hazardous Location Models are unassembled and feature Class I and II protection for flammable and carbon dust environment protection. Horsepower rating based upon maximum speed/load.