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Level of Protection Equipment Protection Provided Should Be Used When Limiting Criteria B RECOMMENDED: The same level of respiratory - The type and atmospheric Use only when the vapor or gases present - Pressure demand,full facepiece SCBA protection but less skin protection concentration of substances have are not suspected of containing high or pressure demand supplied air than Level A. been identified and require a high concentrations of chemicals that are respirator with escape SCBA. level of respiratory protection,but less harmful to skin or capable of being It is the minimum level skin protection. This involves absorbed through the intact skin. - Chemical-resistant clothing(overalls recommended for initial site entries atmospheres: and long-sleeved jacket;hooded,one- until the hazards have been further Use only when it is highly unlikely that the or two-piece chemical splash suit; identified. 1 with IDLH concentrations of specific work being done will generate either high disposable chemical resistant one substances that do not represent a concentrations of vapors,gases,or piece suit). severe skin hazard particulates,or splashes of material that will affect exposed skin. - Inner and outer chemical resistant or gloves. 2 that do not meet the criteria for use of - Chemical resistant safety-boots/shoes. air-purifying respirators. - Hard hat. - Atmosphere contains less than 19.5 percent oxygen. - Two way radio communication. - Presence of incompletely identified OPTIONAL: vapors or gases is indicated by direct- Coveralls. reading organic vapor detection instrument,but vapors and gases are Disposable boot covers. not suspected of containing high levels of chemicals harmful to skin or - Face shield. capable of being absorbed through the intact skin. - Long cotton underwear. C RECOMMENDED: The same level of skin protection as - The atmospheric contaminants,liquid - Atmospheric concentration of chemicals Full facepiece,air purifying,canister- Level B,but a lower level of splashes,or other direct contact will must not exceed IDLH levels. equipped respirator. respiratory protection. not adversely affect any exposed skin. Chemical-resistant clothing(overalls - The types of air contaminants have The atmosphere must contain at least 19.5 and long-sleeved jacket;hooded,one- been identified,concentrations percent oxygen. or two-piece chemical splash suit; measured,and a canister is available disposable chemical resistant one that can remove the contaminant. piece suit). C(continued) Inner and outer chemical resistant gloves. -All criteria for the use of air-purifying respirators are met.