Does the proposed respirator use include any of the following? (check all that apply)
Oxygen deficient atmospheres (those which have an oxygen content equal to or less than 19.5% at sea level, or are above 14,000 feet). If you are working in a normal atmosphere you can assume an oxygen level of 21%. However, if you are working in an area with poor ventilation, or in a confined space, you will need to measure the oxygen level.
The normal atmosphere at altitudes above 14,000 feet is considered oxygen deficient. The standard requires workers above this altitude to have an oxygen enriched atmosphere.
Welding in confined spaces
The exposure concentration of the contaminant(s) is less than or equal to the
Permissible Exposure Limit (PEL)
or other applicable exposure limit?
Is the respirator intended only for escape purposes?
Are conditions such that a worker who is required to wear a respirator cannot escape from the work area without suffering loss of life or immediate or delayed irreversible health effects if the respirator fails (i.e., are the conditions immediately dangerous to life and health (IDLH))?
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U.S. Department of Labor | Occupational Safety & Health Administration | 200 Constitution Ave., NW, Washington, DC 20210
Telephone: 800-321-OSHA (6742) | TTY: 877-889-5627