If a 2,000 ft2 (186 m2) design area is selected, what design density is required...

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.