Header Ads

Sprinkler distribution in Small rooms - NFPA 13

Sprinkler Distribution in Small Rooms According to NFPA 13


Sprinkler Distribution in Small Rooms According to NFPA 13

Sprinkler Distribution in Small Rooms According to NFPA 13



Definition of small room according to NFPA 13 - 2019 edition:

Small Room is defined according to NFPA 13 as a compartment of light hazard occupancy classification having unobstructed construction and a floor area not exceeding 74 m2.

Unobstructed construction is defined according to NFPA 13 as a Construction where beams, trusses, or other members do not impede heat flow or water distribution in a manner that materially affects the ability of sprinklers to control or suppress a fire.


For more information about "Unobstructed Construction", please click here.



Light hazard occupancies are defined according to NFPA 13 as occupancies where fires with low rate of heat release are expected as the quantity or combustibility of contents is low, below are examples for light hazard occupancies:

  • Office buildings
  • Museums
  • Restaurants seating areas
  • Hospitals
  • Educational buildings
  • Institutional building
  • Clubs
  • Church


Constraints for distribution of standard spray pendant & upright sprinklers in light hazard occupancies:

  • Maximum protection area per sprinkler for hydraulically calculated systems is 20m2, and for pipe schedule method systems is 18m2
  • Maximum distance between sprinklers is 4.6m
  • Minimum distance between sprinklers is 1.8m
  • Maximum distance from sprinklers to walls is 2.3m
  • Minimum distance from sprinklers to walls is 100mm.

    Constraints for distribution of standard spray pendant & upright sprinklers in small rooms:

    • Sprinklers shall be permitted to be located not more than (2.7 m) from any single wall.
    • Other spacing limitation and maximum protection area of coverage per sprinkler (mentioned above) shall not be exceeded.


    Examples of sprinklers distribution in small rooms:

    Sprinkler Distribution in Small Rooms According to NFPA 13

    Sprinkler Distribution in Small Rooms According to NFPA 13



    Sprinkler Distribution in Small Rooms According to NFPA 13

    Sprinkler Distribution in Small Rooms According to NFPA 13



    Sprinkler Distribution in Small Rooms According to NFPA 13

    Sprinkler Distribution in Small Rooms According to NFPA 13




    1 comment: