Are others experiencing AHJ's requiring that sprinklers placed in ceiling tiles directly adjacent to HVAC ceiling tile diffusers either be moved to at least 2'-6" away or replaced with intermediate-temperature rated sprinklers?
I am primarily referring to the vane style horizontal discharge diffusers you see in almost every office building, typically with an ordinary-temperature rated sprinkler in the center of an adjacent tile, only 1 ft. away.
Referencing NFPA 13, 2019 Edition, A.184.108.40.206: A diffuser in ceiling sheathing labeled by the manufacturer as "horizontal discharge" has directional vanes to move air further along the ceiling, and sprinklers located within the 2 ft. 6 in. (750 mm) radius should have an intermediate-temperature rating.
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