What is a characteristic of hazardous area classification Class III?

Class III hazardous area classification is characterized specifically by the presence of easily ignitable fibers or materials. This classification pertains to locations where there are combustible fibers or flyings, which can become airborne and create a fire hazard if proper precautions are not taken.

In such areas, the accumulation of these fibers, which can result from various processes, poses a risk of ignition when exposed to an ignition source. Understanding this characteristic is crucial for the implementation of appropriate safety measures and structuring of engineering controls.

The other classifications do not capture the unique risks associated with Class III areas. For instance, Class I pertains to environments with flammable liquids, and Class II is related to hazardous atmospheres with combustible dust. Class III therefore focuses explicitly on the risks from fibers rather than liquids, vapors, or gases, highlighting why the presence of easily ignitable fibers is a defining feature of this classification.