Elevator shafts exert a chimney effect and can draw a fire. People have been trapped in stalled elevators and burned to death. Elevator doors have opened on the fire floor, engulfing occupants in flames. The elevator shaft may be away from the fire, but the mechanical room which operates the system may be compromised causing the elevators to malfunction or stop running. Electricity can be interrupted, causing the elevators to shut down. Rescue from a stalled elevator can take two or three hours. Dangers are so numerous and problematical that elevator manufacturers do not authorize use during fires and will not then be liable for any malfunction. These are the reasons that we have all learned not to use elevators in fires.