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• I. RECOIg4NDATIONS FOR A STANDARD FOR <br /> WORKING IN CONFINED SPACES <br /> NIOSH recommends the procedures set forth in the following sections as a <br /> means of protecting the health, and significantly reducing accidental injury <br /> and death associated with entering, working in, and exiting from confined <br /> spaces. The standard is designed not only to make the confined space safe for <br /> the worker, but also to make the worker cognizant of the hazards associated <br /> with this work area and the safe work practices necessary to deal with these <br /> hazards. The criteria and standard will be reviewed and revised as necessary. , <br /> Section 1 - Definitions - For Purposes of this Document <br /> Atmosphere Refers to the gases, vapors, mists , fumes , <br /> and dusts within a confined space. <br /> Ceiling Level The maximum airborne concentration of a <br /> toxic agent to which an employee may be <br /> exposed for a specified period of time. <br /> Combustible Dust A dust capable of undergoing combustion o: <br /> of burning when subjected to a source of <br /> • ignition. <br /> Confined Space Refers to a space which by design has <br /> limited openings . for entry and exit; <br /> unfavorable natural ventilation which could <br /> contain or produce dangerous air <br /> contaminants, and which is not intended for <br /> continuous employee. occupancy. Confined <br /> spaces include but are not limited to <br /> storage tanks, compartments of ships , <br /> process vessels, pits, silos, vats , <br /> degreasers, reaction vessels, boilers, <br /> ventilation and exhaust ducts, sewers, <br /> tunnels, underground utility vaults, and <br /> pipelines. <br /> Confined Space, Class I A confined space in which the potential <br /> hazard would not require any special modi- <br /> fication of the work procedure. <br /> Confined Space, Class II A confined space that has the potential for <br /> causing injury and illness, if preventive <br /> measures are not used, but not immediately <br /> dangerous to life and health. <br /> Confined Space, Class III A confined space that presents a situation <br /> • that is immediately dangerous to life or <br /> health (IDLH). These include but are not <br /> limited to oxygen deficiency, explosire or <br /> flammable atmospheres, and/or concentrations <br /> of toxic substances. <br />