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0 01 <br /> Appendix 1 - Confined Space Classification Table <br /> Characteristics - Class A- Immediately dangerous.Life-rescue procedures require the entry of more <br /> than one individual.Fully equipped life support equipment is mandatory. <br /> Maintenance of communication requires an additional standby person <br /> stationed within the confined space. <br /> Class B- Dangerous, but not immediately life threatening. Rescue procedures <br /> require the entry of no more than one individual fill equipped with life <br /> support equipment. Indirect visual or auditory communication with <br /> personnel. <br /> Class C- Potentially hazardous. Requires no modification or work procedures. <br /> Standard rescue procedures.Direct communication with personnel from <br /> outside the confined space. <br /> Oxygen - Class A- 16%or less <br /> Class B- (120 mmHg) or greater than 25%* <br /> Class C- (190 mmHg)* <br /> Flammability - Class A- 20%or greater of LFL <br /> Class B- 10%to 19% LFL <br /> Class C- 10% LFL or less <br /> Toxicity - Class A- IDLH** <br /> Class B- Greater than contamination level, less than IDLH** <br /> Class C- Less than contamination level <br /> * Based on a total atmospheric pressure of 750 mmHG (sea level). <br /> ** Immediately dangerous to life or health (IDLH), as referenced in HIOSH Registry Toxic and Chemical <br /> Substances, manufacturing chemists' data sheets, industrial hygiene guides or other recognized <br /> authorities. <br /> 2/99 <br /> Page 19 of 30 <br />