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NFPA is basically a set of recommended standards to provide some uniformity across the country. Each state typically begins with NFPA and modifies or adds from there to create their own regs. Here in Mass each individual city or town may ADD to the state wide code but they cannot remove or delete any of it so minor differences exist from town to town within the state. What I ALWAYS do before I even price a job is to talk over with the inspector, the local Fire Dept here in Mass, exactly what I plan on doing and what they want as far as code requirements. That way the final inspection goes smooth as silk and you aren't left with an additional cost if you have to go back and change or add something. Besides which you look a lot better in the eyes of your customer than having an inspector point out a violation.