This is something that has always confused me.
NFPA 2019 Section 10.2.7.3.1 states that continuous or non-continuous obstructions more than 18" below the deflector have to meet Section 10.2.7.3. The only big requirement I see is that items over 4-ft in width need a sprinkler underneath them.
Does that mean that a sprinkler 18.1" located directly above a square duct that is 3'-11" wide does not need to worried about and the perceived obstruction of the duct is fine by code?
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