We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise. Our goal is to improve fire protection practices worldwide. is a startup community built to help fire protection professionals shine. There are different specific requirements for distance away from "obstructions" for CMSA and ESFR sprinklers. The 3 (or 4) times rule would then be applied if an "obstruction" was present as the requirement for the distance away from the nearest edge of the "obstruction". I am assuming this is a standard spray upright since you referenced the 3 times rule (which only applies to standard spray sprinklers when an "obstruction" is present the 4 times rule would apply if it was a residential or extended coverage upright). Therefore, it depends on the type of upright in question. If the upright in question is an ESFR sprinkler, NEdition Section 8.12.5.3.1 would define this duct as an "obstruction" as the top of the duct is greater than 24 in in width (along with other obstruction rules that would apply even if the duct was less than 24 in in width). wide and is not positioned so that the minimum horizontal distance from the near side of the obstruction to the center of the sprinkler is not less than the value specified in Table 8.11.5.3.2 and Figure 8.11.5.3.2. below the upright deflector and the duct is more than 24 in. If the upright in question is a CMSA sprinkler, NEdition Sections 8.11.5.2.1.1 and 8.11.5.3.2 would define the duct as an "obstruction" as the top of the duct is less than 36 in. below the upright deflector, and the duct is less than 4 ft. If the upright in question is a standard spray, extended coverage, or residential sprinkler, then NEdition Sections 8.5.5.2, 8.5.5.3.1, 8.6.5.2.1.1, 8.6.5.3.1, 8.10.6.3.1, and 8.6.10.3.2 would not define this duct as an "obstruction" as the top of the duct is more than 18 in. Once we know what type of upright that is in question, we can then define "obstruction", as they are defined differently for standard spray and extended coverage sprinklers than for CMSA and ESFR sprinklers. First of all, what type of upright are we dealing with (standard spray, extended coverage, residential, CMSA, ESFR, etc.)?
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