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4 <br /> An operational permit is required to operate a grain elevator, flour starch mill, feed <br /> mill, or a plant pulverizing aluminum, coal, cocoa, magnesium, spices or sugar, or <br /> other operations producing combustible dusts as defined in Chapter 2. <br /> 105.6.8 Combustible Fibers (Optional Permit) <br /> An operational permit is required for the storage and handling of combustiblesfibers in <br /> quantities greater than 100 cubic feet (2.8 m3). <br /> Exception: A permit is not required for agricultural storage. <br /> 105.6.9 Compressed Gases (Optional Permit) <br /> An operational permit is required for the storage, use or handling at normal <br /> temperature and pressure (NTP) of compressed gases in excess of the amounts listed <br /> in Table 105.6.9. <br /> Exception: Vehicles equipped for and using compressed gas as a fuel for propelling <br /> the vehicle. <br /> TABLE 105.6.9 PERMIT AMOUNTS FOR COMPRESSED GASES <br /> TYPE OF GAS AMOUNT <br /> (cubic feet at NTP) <br /> Corrosive 200 <br /> Flammable (except cryogenic fluids and200liquefied petroleum gases) <br /> Highly toxic Any Amount <br /> Inert and simple asphyxiants 6,000 <br /> Oxidizing (including oxygen) 504 <br /> Pyrophoric Any Amount <br /> Toxic Any Amount <br /> For SI: 1 cubic foot= 0.02832 in <br /> a. For carbon dioxide used in beverage dispensing applications, see Section 105.6.4. <br /> 105.6.10 Covered and Open Mall Buildings (Mandatory Permit) <br />