The Equivalent Facilitation Web-based calculator provides architects and engineers with a tool to assist in the design of audible/visible notification device circuits. The A/E visits and selects the Install/Specify System Sensor Products tab or goes directly to, then inputs ceiling strobe candela values and the longest wall and the ceiling height of the room. The calculations are described in Chapter 7 of the 2002 edition of NFPA 72, which permits the use of a performance- based alternative in place of tables for spacing ceiling-mounted audible/visible devices. System Sensor

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