The Economizer series was designed and manufactured specifically to meet New York Citys local code requirements for places of public assembly. This series combines 6 volt 2 or 3 head emergency lighting with an 8 inch self powered exit sign in one compact easy to install unit. Also available in an 8 inch steel exit either self powered or AC only. Listed to UL 924 Standards. Complies with NEC Life Safety Code and OSHA.