The following minimum fire, explosive hazards, humidity, heat and glare standards must be complied with:

    A.    For the purpose of this section, materials are divided into four classifications or ratings based on the degree of fire and explosive hazard. The rating of liquids is established by specified open cup flash points.

    1.    Class I includes slow burning to moderate burning materials. This shall include all liquids with an open cup flash point of one hundred eighty-two (182) degrees Fahrenheit or more.

    2.    Class II includes free burning to intense burning materials. This shall include all liquids with an open cup flash point between one hundred (100) degrees Fahrenheit and one hundred eighty-two (182) degrees Fahrenheit.

    3.    Class III includes materials which produce flammable or explosive vapors or gases under ordinary weather temperature. This shall include all liquids with an open cup flash point of less than one hundred (100) degrees Fahrenheit.

    4.    Class IV includes materials which decompose by detonation, including, but not limited to all primary explosives.

    B.    Class I materials as defined above may be stored, manufactured or utilized in manufacturing processes or other production.

    C.    Class II materials may be stored, manufactured or utilized in manufacturing processes or otherproduction only in accordance with the following provisions:

    1.    Such storage, manufacture or utilization shall be carried on only within buildings or other structures which are completely enclosed by incombustible exterior walls;

    2.    Such buildings or other structures shall either be set back at least forty (40) feet from any lot lines, or in lieu thereof, all such buildings shall be protected throughout by an automatic fire extinguishing system.

    D.    Any activity producing excessive humidity in the form of steam or moist air, or producing intense heat or glare, shall be carried out within an enclosure and in such a manner as not to be perceptible at or beyond any lot line. (Prior code § 19-1-14)