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  1. yamete389

    a requirement from NFPA 13 bothers me a lot since I want to know the fundamental reason of it

    So this given time just poped up from the NFPA guy's head one day and then was written into code.thought any rules or requirment in NFPA must have a solid reason(apparent or compelling) behind them.
  2. yamete389

    a requirement from NFPA 13 bothers me a lot since I want to know the fundamental reason of it

    It says in NFPA 13 that the air supply shall have a capacity capable of restoring normal air pressure in the system within 30 minutes.So where does this "30-minutes" comes from?? is it a time interval relevant to the time of fire duration or this "30-minutes" just exists in this code for nothing?

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