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Depth of obstructions

Question asked by rstrathdee on Feb 19, 2020
Latest reply on Feb 19, 2020 by cdafd

Is anyone aware about depth requirements of obstructions as it relates to figure (a) in NFPA 13?  I have an exit sign that is about 14"x14" approximately 16" away from a pendant head.  Based on the figure, it needs to be ~4' away, but I'm assuming there has to be a depth component of the obstruction that I can't find.  Hypothetically, if the exit sign was turned 90 degrees, the exposed side would only be about 3" wide, but would still apply.