I'm looking for a bit of a reality check this morning. Got an ESFR sprinkler system and unit heaters. In plan view, the heaters are 21" by 40". Top of the heaters will be just below the ESFR deflectors, and they will be located at least 1' horizontally from the ESFR sprinklers. It appears that NFPA 13 (2013) section 8.12.5.2 applies.
Subsection (2) reads: "Additional sprinklers shall not be required where the obstruction is 2 ft or less in width and the sprinkler is located horizontally 1 ft or greater from the nearest edge of the obstruction." Since the heater is 2' or less in its smaller dimension (width), does it matter that the other dimension (length) is greater than 2'? I say the length is not relevant (unless its long enough to obstruct more than 1 sprinkler, then section 8.12.5.3 applies), and subsection (2) allows me to not install a sprinkler below these heaters. How do the rest of you interpret this? Thanks Ed Kramer Bamford Fire
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