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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Classification Terminology

Class III Areas

Class III areas are classified due to the presence of combustible fibers/flyings combustible fibers or flyings
Easily ignitable fibers and flyings include rayon, cotton (including cotton linters and cotton waste), sisal or henequen, istle, jute, hemp, tow, cocoa fiber, oakum, baled waste kapok, Spanish moss, excelsior, and other materials of similar nature. In most cases, sawdust falls into this category because the dust is not fine enough to meet the definition of combustible dust. However, wood dust created by fine sanding may create a Class II area rather than a Class III area., typically not suspended in air, but which may accumulate on surfaces.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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