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NFPA101, 7.7.2(4)(b)i on page 312, where is "the length" indicating?

Question asked by horsham89 on Mar 20, 2017
Latest reply on Jun 9, 2017 by lpgallagher

I understand "the depth 10ft from the exterior of the building, so far, but not quite "the length not more than 30 ft (9.1m)" does indicate from where to where. And even the unit is not the same. I'd be very appreciated if any of you guys let me.