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The difference between the Low and Medium Hazard Industrial Occupancies is related to the combustible content of the contents of the building in question and not the potential toxicity of those materials.
A Low Hazard Industrial Occupancy (F3) is defined in Part 1 of the Code as being an industrial occupancy in which the combustible content is not more than 50 kg/m or 1200 MJ/m of floor area; similarly a Medium Hazard Industrial Occupancy (F2) is defined as being an industrial occupancy in which the combustible content is more than 50 kg/m or 1200 MJ/m of floor area but not classified as High Hazard Industrial Occupancy.
A High Hazard Industrial Occupancy (F1) is one that contains sufficient quantities of highly combustible and flammable or explosive materials which, because of their inherent characteristics, constitute a special fire hazard. The proponent should be asked to provide details of the combustibility of the materials being stored in the chemical storage area to ascertain whether they would be classified as F1.
March 20, 1996
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