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Does Sure-Lites emergency units operate for 90 minutes?

All exit and emergency units operated within the capacity listed in the Buyer's guide, and on their specification sheets will operate for a minimum of 90 minutes; adhering to U.L. 924 2006 70.1.6, and NFPA 101 - 2006 7.9.3. If the capacity of the unit is exceeded, it will not operate for the full 90-minute duration.  Please adhere to the Buyer's guide page and or Specification sheets provided for each individual unit to insure to remain within the proper operational guidelines. Certified compliance is listed on the individual spec sheets, and the units will have a U.L. label.