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R313.2 One- And Two-Family Dwellings Automatic Fire Systems
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An automatic residential fire sprinkler system shall be installed in one- and two-family dwellings.
Exception: An automatic residential fire sprinkler system shall not be required for additions or alterations to existing buildings that are not already provided with an automatic residential sprinkler system.
Automatic residential fire sprinkler systems shall be designed and installed in accordance with Section P2904 or NFPA 13D.
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