1When required by the provisions of NFPA 101, developmental disabilities facilities may use NFPA 13, “Standard for the Installation of Sprinkler Systems”, or NFPA 13D, “Standard for the Installation of Sprinkler Systems in One and Two-Family Dwellings and Mobile Homes”, or NFPA 13R, “Standard for the Installation of Sprinkler Systems in Residential Occupancies up to Four Stories in Height”, when applicable.