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CONFINED SPACE CLASSIFICATION TABLE <br /> Parameters Class I Class II Class III <br /> Characteristics potential hazard-requires dangerous, but not immediately immediately dangerous to life- <br /> no modification of work life .threatening-rescue pro- rescue procedures require the <br /> procedures-standard rescue cedures require the entry--of entry of more than one individual <br /> procedures-direct communi- no more than one individual fully equipped with life support <br /> cation with workers, from fully equipped with life sup- equipment-maintenance of'nom- <br /> outside the confined space. port equipment-indirect visual munication requires an additional <br /> or auditory communication with standby person stationed within <br /> workers. the confined space. <br /> Oxygen 19.57 - 21.47 16.17 to 19.47 167 or less <br /> *(148. - * _ <br /> 1 122 147 mm H 122 mm H ) or _ <br /> ( 48. 163 mmHg) ( g) ( g <br /> or 21.57 to 257 greater than 257 <br /> (163 - 190 mm Hg) *090 mm Hg) <br /> Flammability 107 LFL or less 107 - 197 LFL 207 or greater of LFL <br /> Characteristics <br /> Toxicity less than contamination greater than contamination **IDLH <br /> level referenced in 29 CFR level, referenced in 29 CFR <br /> Part 1910 Sub Part Z Part 1910 Sub Part Z - less <br /> than **IDLH <br /> *Based upon a total atmospheric pressure of 760 mm Hg (sea level) <br /> **Immediately Dangerous 'to Life or Health - as referenced in NIOSH Registry of Toxic <br /> and Chemical Substances; Manufacturing Chemists data sheets, industrial hygiene <br /> guides or other recognized authorities. <br />