cdafd below is the reference.
What are common examples of the various flammable and combustible liquids classified by NFPA 30?
Class IA - Diethyl Ether, Ethylene Oxide, some light crude oils
Class IB - Motor and Aviation Gasolines, Toluene, Lacquers, Lacquer Thinner
Class IC - Xylene, some paints, some solvent-based cements
Class II - Diesel Fuel, Paint Thinner
Class IIIA - Home Heating Oil
Class IIIB - Cooking Oils, Lubricating Oils, Motor Oil
Owner wants entire facility protected (mixer / production room & storage)