Results
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Ceiling Sprinkler Density
gpm/sq ft
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In-Rack Sprinklers Needed
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Ceiling Sprinkler Demand
gpm
Note: Rack storage protection per NFPA 13 Chapter 20 depends on commodity classification, storage arrangement (single/double/multi-row), storage height, and ceiling clearance. In-rack sprinklers reduce ceiling density requirements. ESFR sprinklers may eliminate need for in-rack sprinklers up to certain heights.
Reference
NFPA 13 Chapter 20 - Rack Storage Protection:
Class I-II: 0.20-0.40 gpm/ft2, area 2000-2500 ft2
Class III: 0.25-0.45 gpm/ft2, area 2000-3000 ft2
Class IV: 0.30-0.60 gpm/ft2, area 2500-3000 ft2
In-rack levels at every 10 ft of storage
Ceiling demand = density × design area