PE Prep Series Also, I know that the light fixtures in our office are immediately adjacent to the ceiling tiles that have the sprinkler heads in the center and the ceiling tiles are 24 inches. These requirements shouldn't be applied for anything except light hazard occupancies because the testing that was done to justify the addition of this code section only evaluated sprinkler performance in a light hazard environment. Try looking in NFPA 13 on the NFPA website. If you look at your concealed cut sheet and find that the deflector falls 1 1/2" out of the concealed head, you'd be 5 1/2" obstructed by the light (7"-1 1/2"). The property owner or their representative must evaluate (4.1.7.1) whether the protection is adequate and, if not, correct the deficiency (4.1.7.2). In NFPA 13, the type of sprinkler system installed also plays a role in determining the maximum space between fire sprinklers. Smoke Management February 2019 Minimum Distance Between Sprinklers: typically 6'-0". The only exception to this rule is where ceiling-type sprinklers, such as concealed, recessed, and flush types, have the operating element above the ceiling and the deflector, skylights, sprinklers shall be permitted to be omitted from skylights not exceeding 32, horizontally from any other unprotected skylight or unprotected ceiling pocket. July 2019 May 2021 As a result, that sprinkler may not discharge on timeor at all. January 2019 If not, what is the general rule and where can I find it? The basic rule for these obstructions is simple. Can we allow a tolerance of 300mm to 400mm clearance between sprinkler heads and parking building slab soffit? from the ceilingabove, assuming unobstructed construction. We oftenfindno sprinkler protection or coverage abovesuch largeobstructions where sprinklers have been provided below. For obstructions below 18 inches for standard pendent and upright spray sprinklers this means that as long as the obstruction is less than 4ft (1.2 m) wide that it is not considered an obstruction. This room needs two sprinklers. The inspector is correct. Room A (245 ft.2) and Room B (637 ft.2) are both small rooms. February 2022 Distance from Ceiling: minimum 1", maximum 12" for unobstructed construction. That would put your sprinkler 1'-6" to 2' away from the near edge of the light.
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