Which NFPA standard would you consult for guidelines on sprinkler systems in multi-family residential units?

NFPA 13R is the appropriate standard to consult for guidelines on sprinkler systems in multi-family residential units. This standard specifically provides requirements for the design and installation of sprinkler systems in residential occupancies, including those that are three stories or less in height, which makes it suitable for multi-family residential buildings.

The focus of NFPA 13R is on protecting life safety in residential settings while allowing for a more simplified design approach compared to the more comprehensive NFPA 13. This means that the requirements under NFPA 13R are tailored to address the needs of typical residential occupancies without the need for the full level of protection that NFPA 13 provides, which is reserved for larger or more complex buildings.

Other standards mentioned are more specific to different building types or fire protection methods; NFPA 13 covers all types of sprinkler systems, NFPA 13D is intended for one- and two-family dwellings, and NFPA 20 relates to the installation of fire pumps. Therefore, NFPA 13R is the most relevant choice for multi-family residential units for its specific focus on that occupancy type.