Rooms for the storage and handling of flammable liquids shall be constructed with walls, floors and ceilings, have a fire resistance rating of not less than one hour; provided that where, in the opinion of the clerk, the hazard is more than moderate, based upon a consideration of the quantity and nature of the liquids involved and the extent of mixing operations together with the construction, a fire resistance rating of not less than two (2) hours shall be required.
Door openings to the room shall be equipped with approved automatic or self-closing fire doors and shall have sills raised at least six inches (6") above the room floor. (1961 Code)