Coffee Break Training: Fire Alarms and Detection: Smoke Detector Placement for Elevator Recall [open pdf - 214KB]
"The location of this spot-type smoke detector for the adjacent elevator's Phase I Emergency Recall Operation is intriguing and deserves closer scrutiny. According to NFPA 72®, 'National Fire Alarm Code', a lobby smoke detector to initiate Phase I recall must be located on the ceiling within 21 feet (6.4 m) of the centerline of each elevator door within the elevator bank under control of the detector. Spot-type smoke detectors should be located on the ceiling not less than 4 inches (100 mm) from a sidewall to the near edge or, if on a sidewall, between 4 inches and 12 inches. (100 mm and 300 mm) down from the ceiling to the top of the detector. The purpose of Phase I Emergency Recall Operation is to have the elevator automatically return to the recall level before fire can affect its safe operation."
Coffee Break Training - Fire Protection Series No. FP-2010-2
U.S. Fire Administration: http://www.usfa.dhs.gov/