A dairy processing plant containing empty plastic crates to a maximum height of 5 ft...

A dairy processing plant with empty plastic crates up to 5 ft high would typically be classified as Ordinary Group 1. The crates present a moderate fire load, but not as high as would warrant an Ordinary Group 2 or Extra Hazard classification.

References: NFPA 13's occupancy hazard classifications, which provide guidelines for determining the appropriate classification based on the combustibility and quantity of stored materials.