That is an urban legend according to a few sprinkler inspectors I've spoken to. 1356 INSTALLATION OF SPRINKLER SYSTEMS. The design requirements for ESFR sprinklers were expanded to allow the user to choose the storage height and then the building height for any allowable arrangement. I would believe it would be less expensive if you would turn up the sprinklers and install upright sprinkler heads in the construction area. (1.5 m) in diameter, provided the plan view of the fan is at least 50 percent open. 18 inches maximum distance from the roof decking or ceiling. NFPA’s technical advisory program, which gives NFPA members an opportunity to ask questions relating to code requirements, receives multiple questions each week on how to locate sprinklers when cloud ceilings are present. A cloud ceiling is simply a suspended ceiling that covers only a portion of a room or space below, typically to hide mechanical equipment. Design requirements for the protection of storage on solid shelves were added. With obstructed construction, you can be 1-6" below the bottom of the beams to a maximum of 22". Table 8.6.2.2.1(b) Protection Areas and Maximum Spacing 8.6.3.2 Maximum Distance from Walls. Find the listing on the sprinkler head, and it should have the distance requirements available. 15’ between sprinkler heads, 7.5’ from walls) Minimum distance between sprinkler heads: usually 6’ Distance from ceilings: minimum 1”, maximum 12”. Requirements for the Per NFPA 13, the standard for installation of automatic fire sprinkler systems, in unobstructed construction, the minimum deflector distance from the ceiling is 1" and the maximum is 12". There is no hard and fast rule on the distance. The fire watch does not affect the rated barrier, but the 1-hour fire rated barrier is required to separate the construction area from the occupied area if there are no sprinklers in the construction area. I hope that helps to answer your question. Viking Standard Response Upright Sprinkler VK598 is a thermosensitive glass bulb spray sprinkler available in various temperature ratings to meet design requirements. In terms of obstruction from the fan blades, NFPA 13 also allows sprinklers to be placed "without regard" to the blades of ceiling fans less than 60 inches (1.5 m) in diameter as long as the plan view is at least 50 percent open (NFPA 13 2010-19 under "Obstructions to Sprinkler Discharge Pattern Development" subsections in Chapter 8). The residential code says pendant sprinklers must be at least 3 ft from obstructions such as ceiling fans and lights (as measured from their centers), or you can use this table which relates A) the distance from the sprinkler to the near edge of the obstruction and B) height of the sprinkler's deflector above the bottom of the obstruction. ceiling were addressed, including skylights, stepped ceilings, and ceiling pockets. 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