General Cautions and Limitations for 21C - Particulate Respirators (Part 11)
These limitations are by no means all inclusive. The respirator manufacturer may also identify further cautions and limitations for their respirators. In addition, regulatory agencies may also place a limit on the use of respirators in their standards.
- Approval
- Limitations - Single Use
- Limitations - Dusts, Dusts and Mists, and Dusts, Fumes and Mists
- Limitations - High-efficiency
- Additional limitations for combination Type C Supplied-Air Respirators with escape high-efficiency respirators
Approval
| 21C - Particulate Respirators (Part 11) | |
|---|---|
| Single Use | Approved for respiratory protection against pneumoconiosis- and fibrosis- producing dusts and mists. |
| Dusts | Approved for respiratory protection against dusts having an exposure limit measured as a time weighted average not less than 0.05 milligram per cubic meter or 2 million particles per cubic foot. |
| Dusts and Mists | Approved for respiratory protection against dusts and mists having an exposure limit measured as a time weighted average not less than 0.05 milligram per cubic meter or 2 million particles per cubic foot. |
| Dusts, Fumes and Mists | Approved for respiratory protection against dusts, fumes and mists having an exposure limit measured as a time weighted average not less than 0.05 milligram per cubic meter or 2 million particles per cubic foot. |
| High-efficiency | Approved for respiratory protection against dusts, fumes and mists having an exposure limit measured as a time weighted average less than 0.05 milligram per cubic meter and radionuclides. |
| Radon Daughters | Approved for respiratory protection against radon daughters, and radon daughters attached to dust, fumes and mists. |
| Asbestos | Approved for respiratory protection against asbestos-containing dusts and mists |
Limitations - Single Use
- Not for use in atmospheres immediately dangerous to life or health.
- Not for use in atmospheres containing less than 19.5 percent oxygen.
- In making renewals and repairs, parts identical with those furnished by the manufacturer under the pertinent approval shall be maintained.
- Follow the manufacturer's instructions for changing filters.
- Refer to approval label and instruction and maintenance manuals for additional information on use and maintenance of these respirators.
- The respirator shall be selected, fitted, used and maintained in accordance with Mine Safety and Health Administration and other applicable regulations.
Limitations - Dusts, Dusts and Mists, and Dusts, Fumes and Mists
- Not for use in atmospheres immediately dangerous to life or health.
- Not for use in atmospheres containing less than 19.5 percent oxygen.
- In making renewals and repairs, parts identical with those furnished by the manufacturer under the pertinent approval shall be maintained.
- Refer to approval label and instruction and maintenance manuals for additional information on use and maintenance of these respirators.
- Follow the manufacturer's instructions for changing filters.
- The respirator shall be selected, fitted, used and maintained in accordance with Mine Safety and Health Administration and other applicable regulations.
Limitations - High-efficiency
- Not for use in atmospheres immediately dangerous to life or health.
- Not for use in atmospheres containing less than 19.5 percent oxygen.
- In making renewals and repairs, parts identical with those furnished by the manufacturer under the pertinent approval shall be maintained.
- Refer to approval label and instruction and maintenance manuals for additional information on use and maintenance of these respirators.
- Follow the manufacturer's instructions for changing filters and replacing respirators.
- The respirator shall be selected, fitted, used and maintained in accordance with Mine Safety and Health Administration and other applicable regulations.
Additional Limitations - Combination Type C Supplied-Air Respirator with Escape High-efficiency Respirator
- Use only the hose lengths and pressure ranges specified on the approval label.
- When airflow is cut off, switch to filter and immediately exit to clean air.
- CEL Data last Updated: N/A
- Page last reviewed: December 13, 2024
- Page last updated: December 13, 2024
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Content source:
- National Institute for Occupational Safety and Health (NIOSH)
- Page maintained by: National Personal Protective Technology Laboratory