An 18-inch deep x 3-foot wide duct is located with the top of the duct 20 inches below the upright sprinkler deflector. The sprinkler is centered above the duct. NFPA 13 (2016 Edition) has the 3x rule (220.127.116.11.1.3) which only applies to structural members in light and ordinary occupancies, and the duct is not over 4-feet wide which would require sprinklers by 18.104.22.168.3. Is this arrangement acceptable by code?
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