The fan can be mounted on the wall or the ceiling of the horse stall with screws or brackets. Make sure that the fan is securely attached to the wall so that it does not fall and injure the horse. The fan should also be out of the horse's reach so that it cannot tamper with it.
When selecting a fan for a horse stall, choose a fan that is designed for outdoor use. The fan should be rated for wet locations and have a corrosion-resistant finish. The fan should also have guards to protect the horse from being injured by the fan blades.
Make sure that the fan is properly grounded when installing it in the horse stall. A fan that is not properly grounded can create a fire hazard. If possible avoid using an extension cord with a fan in a horse stall. The extension cord can also create a fire hazard.