For Class IV commodities stored on back-to-back shelves up to 14 ft, a design density of 0.295 gpm/ft² for a 2,000 ft² design area is a reasonable requirement. This density provides adequate water coverage for the combustibility and configuration of Class IV commodities.
References: NFPA 13's storage and commodity classification guidelines, which help in determining the required design densities for various storage configurations and commodity types.
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