Section 59.1. Division D-H (hazardous occupancies)

Buildings primarily used for occupancies involving highly combustible, explosive or unstable products or materials that constitute a special fire, life or toxic hazard because of the forms, characteristics or volume of the materials used shall be classified as Division D-H occupancies. A building, structure or a part thereof used for storage, warehousing, manufacturing, processing, use or sale of highly combustible products or materials, including the following and those of equal fire and life hazard shall be classified under D-H hazardous occupancies.

(1) Chemicals which pose serious flame or explosive hazards upon coming into contact with water or moisture, such as metallic sodium, metallic potassium, sodium peroxide, calcium phosphide, yellow phosphorous and metallic magnesium powder, aluminum powder, calcium carbide, red phosphorus and the like.

(2) Processes which produce dust, lint or other particles or matter liable to instantaneous ignition or explosion.

(3) Ammonia, chlorine, phosgene, carbon bisulphide, and other toxic irritants or corrosives and fume hazard gases such as acetylene, ether, ethyl chloride, ethylene, liquified hydro-carbons, ethyl chloride gas, and similar gases.

(4) Naphtha, ether, benzol, styrene, butadiene, collodion, ethyl, acetate, amyl acetone, amyl alcohol, kerosene, turpentine, petroleum paint (including paint mixing and spraying rooms), varnish, dryer, gasoline, alcohol, oil in bulk quantities and similar highly flammable liquid. (Paint spray booth approved by the Department shall be classified as D-O occupancies).

(5) Manufacture and processing of imitation leather, paint, and other pyroxylin products.

(6) Storage of nitrocellulose, or products composed in whole or in part of nitrocellulose or similar flammable materials, such as films, combs, pens, pencils, toilet articles, and the like.

(7) Hydrocloric, nitric, sulphuric and hydrofluoric acids.

(8) Asphalt, tar pitch, resin, waxes and fats, either alone or combined with other materials.

(9) Flammable fibrous materials such as hay, straw, broomcorn, hemp, tow, jute, sisal, excelsior, kapok, hair, oakum, and the like.

(10) Processing or storing of artificial flowers, matches, mattresses, rubber, cork, brooms, carpet linings, paper, pasteboard, feathers, cotton, including cotton rag sorting rooms, shoddy mills, oil refineries, distilleries, sugar refineries, cereal, flour, grist and starch mills, rendering plants, drying rooms, and occupancies of equal fire and life hazard.