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NFPA 80-16  21.9 Periodic inspection and testing. What does periodic testing imply? weekly, monthly, quarterly?

Question asked by tplietz on Mar 29, 2017
Latest reply on Jun 9, 2017 by lpgallagher

I have a third party agency report for a Fire Curtain, The report is identifying that ITM is required to be inspected 4 times a year.

Your interpretation will be helpful