The bank is 20,000 square feet and is required to be fully sprinkle red. Can they omit sprinkler head inside the vault? If they can what section of the code you can use. Thanks.
There is no section of NFPA 13 that permits the omission of sprinklers in a bank vault. The omission must be permitted/accepted by an AHJ.
Some will allow it because of the vault construction.
Some May want smoke detection, or other protection,, if no sprinkler.
Plus ask the owner and insurance company, they may want it, depending on what is in the vault.
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