Fire Exit Signs, also known as Fire Escape Route Signs, must be visible even when the power supply fails. Illuminated fire escape route signs and fire exit signs fulfil this requirement. The minimum backup duration of emergency lighting as specified by regulations is generally between 1 and 3 hours. For more information on emergency lighting see our emergency lighting guide. To view our full range of illuminated fire exit signs visit Safelincs Illuminated Fire Exit Signs Portal.