![]() Continuous and isolated obstructions 2 inches (50 mm) or less in width and located a minimum of 2 feet (600 mm) below the elevation of the sprinkler deflector or located a minimum of 1 foot (300 mm) horizontally from the sprinkler.Continuous obstructions 2 feet (600 mm) or less in width and located a minimum of 2 feet (600 mm) horizontally from the sprinkler.Continuous obstructions 1 foot (300 mm) or less in width and located a minimum of 1 foot (300 mm) horizontally from the sprinkler.Sprinklers arranged per allowable distances from Table 14.2.11.1.1 for horizontal obstructions below the elevation of sprinklers, or where a row of sprinklers is installed under the obstruction.While renumbered in the 2019 edition, these clearance requirements have been unchanged in NFPA 13 for several cycles. Instead, a series of horizontal clearance conditions apply. However, unlike standard-spray sprinklers, no “three-times rule” exists. Like standard-spray sprinklers, continuous obstructions located at or below the deflector shall not be closer than 1 foot horizontally from the sprinkler. ![]() From NFPA 13 definitions, a continuous obstruction affects the discharge pattern of two or more adjacent sprinklers an isolated obstruction affects a single sprinkler. Note that there are differences for clearance for continuous obstructions vs. NFPA 13-2019 edition, Standard for the Installation of Sprinkler Systems, specifies requirements for clearance to obstructions in Chapter 14. This month, we’ll look more closely at situations where ESFR sprinklers can be installed but the specific location of each sprinkler is challenged by obstructions and building features.īecause the discharge pattern of ESFR sprinklers differs from standard-spray sprinklers, obstructions near the sprinkler deflector that may be an annoyance for standard-spray sprinklers can defeat an ESFR sprinkler’s water distribution. Examples included protection of flammable/combustible liquids, open-top containers and buildings greater than 40-feet high. In the December 2019 issue, this column centered on occupancies and building features not appropriate for early suppression fast response (ESFR) sprinkler protection.
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