Per NFPA 13: Standard for the Installation of Sprinkler Systems, 18 inches of clearance must be maintained below sprinkler deflectors to ensure proper spray pattern and fire suppression coverage.
C. 18 (Correct).
Less than 18 inches (12 or 15) is insufficient clearance.
More than 18 (24 inches) exceeds the standard, not required.
[References:, NFPA 13: Standard for Installation of Sprinkler Systems, Section on Obstructions and Clearances., CHFM Candidate Handbook – Compliance domain., ________________________________________]
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