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1910.134(d)(3) Respirators for Atmospheres That Are Not IDLH
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1910.134(d)(3)(i)
The employer shall provide a respirator that is adequate to protect the health of the employee and ensure compliance with all other OSHA statutory and regulatory requirements, under routine and reasonably foreseeable emergency situations.
1910.134(d)(3)(i)(A) Assigned Protection Factors (APFs)
Employers must use the assigned protection factors listed in Table 1 to select a respirator that meets or exceeds the required level of employee protection. When using a combination respirator (e.g., airline respirators with an air-purifying filter), employers must ensure that the assigned protection factor is appropriate to the mode of operation in which the respirator is being used.
Notes:
1Employers may select respirators assigned for use in higher workplace concentrations of a hazardous substance for use at lower concentrations of that substance, or when required respirator use is independent of concentration.
2The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section (29 CFR 1910.134), including training, fit testing, maintenance, and use requirements.
3This APF category includes filtering facepieces, and half masks with elastomeric facepieces.
4The employer must have evidence provided by the respirator manufacturer that testing of these respirators demonstrates performance at a level of protection of 1,000 or greater to receive an APF of 1,000. This level of performance can best be demonstrated by performing a WPF or SWPF study or equivalent testing. Absent such testing, all other PAPRs and SARs with helmets/hoods are to be treated as loose-fitting facepiece respirators, and receive an APF of 25.
5These APFs do not apply to respirators used solely for escape. For escape respirators used in association with specific substances covered by 29 CFR 1910 subpart Z, employers must refer to the appropriate substance-specific standards in that subpart. Escape respirators for other IDLH atmospheres are specified by 29 CFR 1910.134 (d)(2)(ii).
| Type of respirator1, 2 | Quarter mask | Half mask | Full facepiece |
Helmet/hood | Loose-fitting facepiece |
|---|---|---|---|---|---|
| 1. Air-Purifying Respirator | 5 | 310 | 50 | ||
| 2. Powered Air-Purifying Respirator (PAPR) | 50 | 1,000 | 425/1,000 | 25 | |
3. Supplied-Air Respirator (SAR) or Airline Respirator
|
10 50 50 |
50 1,000 1,000 |
.. 425/1,000 .. |
25 |
|
4. Self-Contained Breathing Apparatus (SCBA)
|
10 |
50 10,000 |
50 10,000 |
1Employers may select respirators assigned for use in higher workplace concentrations of a hazardous substance for use at lower concentrations of that substance, or when required respirator use is independent of concentration.
2The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section (29 CFR 1910.134), including training, fit testing, maintenance, and use requirements.
3This APF category includes filtering facepieces, and half masks with elastomeric facepieces.
4The employer must have evidence provided by the respirator manufacturer that testing of these respirators demonstrates performance at a level of protection of 1,000 or greater to receive an APF of 1,000. This level of performance can best be demonstrated by performing a WPF or SWPF study or equivalent testing. Absent such testing, all other PAPRs and SARs with helmets/hoods are to be treated as loose-fitting facepiece respirators, and receive an APF of 25.
5These APFs do not apply to respirators used solely for escape. For escape respirators used in association with specific substances covered by 29 CFR 1910 subpart Z, employers must refer to the appropriate substance-specific standards in that subpart. Escape respirators for other IDLH atmospheres are specified by 29 CFR 1910.134 (d)(2)(ii).
1910.134(d)(3)(i)(B) Maximum Use Concentration (MUC)
1910.134(d)(3)(i)(B)(1)
The employer must select a respirator for employee use that maintains the employee's exposure to the hazardous substance, when measured outside the respirator, at or below the MUC.
1910.134(d)(3)(i)(B)(2)
Employers must not apply MUCs to conditions that are immediately dangerous to life or health (IDLH); instead, they must use respirators listed for IDLH conditions in paragraph (d)(2) of this standard.
1910.134(d)(3)(i)(B)(3)
1910.134(d)(3)(iii)
For protection against gases and vapors, the employer shall provide:
1910.134(d)(3)(iii)(A)
1910.134(d)(3)(iii)(B)
An air-purifying respirator, provided that:
1910.134(d)(3)(iii)(B)(1)
The respirator is equipped with an end-of-service-life indicator (ESLI) certified by NIOSH for the contaminant; or
1910.134(d)(3)(iii)(B)(2)
If there is no ESLI appropriate for conditions in the employer's workplace, the employer implements a change schedule for canisters and cartridges that is based on objective information or data that will ensure that canisters and cartridges are changed before the end of their service life. The employer shall describe in the respirator program the information and data relied upon and the basis for the canister and cartridge change schedule and the basis for reliance on the data.
1910.134(d)(3)(iv)
For protection against particulates, the employer shall provide:
1910.134(d)(3)(iv)(A)
1910.134(d)(3)(iv)(B)
An air-purifying respirator equipped with a filter certified by NIOSH under 30 CFR part 11 as a high efficiency particulate air (HEPA) filter, or an air-purifying respirator equipped with a filter certified for particulates by NIOSH under 42 CFR part 84; or
1910.134(d)(3)(iv)(C)
For contaminants consisting primarily of particles with mass median aerodynamic diameters (MMAD) of at least 2 micrometers, an air-purifying respirator equipped with any filter certified for particulates by NIOSH.
1Above 8,000 feet the exception does not apply. Oxygen-
enriched breathing air must be supplied above 14,000 feet.
TABLE I. -- ASSIGNED PROTECTION FACTORS
[RESERVED]
[RESERVED]
| Altitude (ft.) | Oxygen deficient Atmospheres (% 02) for which the employer atmosphere- may rely on supplying respirators |
|---|---|
| Less than 3,001 3,001-4,000 4,001-5,000 5,001-6,000 6,001-7,000 7,001-8,0001 |
16.0-19.5 16.4-19.5 17.1-19.5 17.8-19.5 18.5-19.5 19.3-19.5. |
1910.134(d)(3)(ii)
The respirator selected shall be appropriate for the chemical state and physical form of the contaminant.
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