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. Wall mount includes wall bracket with swing action arm for side-to-side placement. Meets OSHA standards, UL listed. Includes a junction box for hard wiring. All 240V/480V models have a 3-phase motor. 277V Models have a single-phase motor and fully assembled fan head. Explosion Proof Models feature Class I and II protection for flammable and carbon dust environment protection. Available in 240V with single-phase motor or 480V, 3-phase motor.