True Lockout/Tagout Technology The Fan Lock not only protects in times of a hurricane, but also offers true lockout/tag-out functionality.  Without a Fan Lock, the only methods available to stop the free rotation of a fan and secure the fan to resist further free rotation are through unsafe work practices.  To stop free fan rotation, a 2x4 would be wedged against the driveshaft to create enough friction to overcome the momentum of the rotating fan.  To provide energy control, one end of a rope would be tied around a fan blade and the other end to the tower structure.  These methods create obvious safety hazards and cause unnecessary stress on the tower’s mechanical equipment.  Installing a Fan Lock eliminates these safety concerns and protects the service life of the mechanical equipment.