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4. SUPPLIED AIR SYSTEMS <br />Supplied air systems are typically used in situations where IDLH or <br />Oxygen deficiency conditions exist, where contaminant levels exceed <br />approval limits for air purifying systems, and where self-contained <br />breathing apparatus (SCBA) use is not practical (i.e., equipment <br />too bulky for work operations, or work to occur over an extended <br />period where frequent air bottle changes would be required). <br />Supplied air systems function by supplying breathing quality air <br />from a stationary source (compressed air bottles or compressor <br />unit), through an airline, to a an air regulator unit and then a <br />mask or facepiece worn by the user. Some systems combine either an <br />air-purifying element, or a self-contained air supply, for use in <br />escape in the event that the air supply is interrupted or fails <br />(kinking/cutting of airline; compressor failure) [NOTE: air- <br />purifying systems generally are not acceptable for escape from IDLH <br />conditions]. <br />For the purposes of the type of work conducted under this program, <br />only positive demand3 type units will be used. ~ <br />El~LOYEE TRAINING: <br />All employees who use, and all supervisors who oversee operations <br />involving the use of, respirators will receive appropriate training. <br />The training will, at a minimum, consist of the following elements: <br />1. Identification of the potential respiratory hazards to which <br />they will be exposed, and the potential health consequences of <br />unprotected exposure. <br />2. An explanation of why respirators will be worn (e.g., <br />engineering controls are not feasible; added.margin of safety <br />beyond use of engineering controls; etc). <br />3. Discussion of the respirator system to be used, its <br />capabilities, and its limitations. <br />4. Instruction on actual use and care of respirator. This <br />instruction will be hands-on, and include how to properly fit <br />and don the unit. <br />5. A discussion of the operating and safety procedures to be used <br />in the project, as they relate to the use of respiratory <br />protection equipment. <br />6. A discussion of how to recognize an emergency situation, and <br />specific emergency response procedures. <br />