Assigned protection factors (APFs) for each respirator class under federal OSHA (29 CFR 1910.134 Table 1) and Cal/OSHA (8 CCR 5144), and — the derived layer — the maximum use concentration (MUC) each respirator class supports for a given substance, computed as APF × the applicable exposure limit. The regulation itself states the formula ('The MUC can be determined mathematically by multiplying the assigned protection factor... by the required OSHA permissible exposure limit'), but nobody publishes the computed per-substance table, and OSHA and Cal/OSHA limits differ up to 10× for 66 substances — so the same respirator is adequate federally and inadequate in California for the same job. Answers 'what APF does a half mask have', 'what respirator do I need for styrene at 300 ppm', and 'is my respirator sufficient under Cal/OSHA'. Pairs with the existing workplace-exposure-limits asset (1,184 records, two authorities) — the MUC pages are that asset multiplied through this one.

US federal and California regulatory text; facts not copyrightable, sections quoted with citation.

Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Full facepiece

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 1,000

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>

Supplied-Air Respirator (SAR) or Airline Respirator — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Half mask

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Helmet/hood

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 25/1,000

**Jurisdiction:** 29 CFR 1910.134

**Conditions:** The 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.

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | | • Pressure-demand or other positive-pressure mode (e.g., open/closed circuit) | | | 10,000 | 10,000 | | Notes: | 1 Employers 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. | 2 The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section ( <https://www.ecfr.gov/current/title-29/section-1910.134> 29 CFR 1910.134 ), including training, fit testing, maintenance, and use requirements. | 3 This APF category includes filtering facepieces, and half masks with elastomeric facepieces. | 4 The 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. |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Loose-fitting facepiece

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 25

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Self-Contained Breathing Apparatus (SCBA)

**Facepiece:** Full facepiece

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>

Self-Contained Breathing Apparatus (SCBA) — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Full facepiece

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Self-Contained Breathing Apparatus (SCBA)

**Facepiece:** Half mask

**Operating mode:** Demand mode

**Assigned protection factor:** 10

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Half mask

**Operating mode:** Demand mode

**Assigned protection factor:** 10

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Self-Contained Breathing Apparatus (SCBA)

**Facepiece:** Helmet/hood

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Full facepiece

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>

Air-Purifying Respirator — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Full facepiece

**Assigned protection factor:** 1,000

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>

Powered Air-Purifying Respirator (PAPR) — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Half mask

**Assigned protection factor:** 10

**Jurisdiction:** 29 CFR 1910.134

**Conditions:** This APF category includes filtering facepieces, and half masks with elastomeric facepieces.

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | | • Pressure-demand or other positive-pressure mode (e.g., open/closed circuit) | | | 10,000 | 10,000 | | Notes: | 1 Employers 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. | 2 The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section ( <https://www.ecfr.gov/current/title-29/section-1910.134> 29 CFR 1910.134 ), including training, fit testing, maintenance, and use requirements. | 3 This APF category includes filtering facepieces, and half masks with elastomeric facepieces. |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Half mask

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Helmet/hood

**Assigned protection factor:** 25/1,000

**Jurisdiction:** 29 CFR 1910.134

**Conditions:** The 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.

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | | • Pressure-demand or other positive-pressure mode (e.g., open/closed circuit) | | | 10,000 | 10,000 | | Notes: | 1 Employers 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. | 2 The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section ( <https://www.ecfr.gov/current/title-29/section-1910.134> 29 CFR 1910.134 ), including training, fit testing, maintenance, and use requirements. | 3 This APF category includes filtering facepieces, and half masks with elastomeric facepieces. | 4 The 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. |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Loose-fitting facepiece

**Assigned protection factor:** 25

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Self-Contained Breathing Apparatus (SCBA)

**Facepiece:** Full facepiece

**Operating mode:** Pressure-demand or other positive-pressure mode (e.g., open/closed circuit)

**Assigned protection factor:** 10,000

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | | • Pressure-demand or other positive-pressure mode (e.g., open/closed circuit) | | | 10,000 | 10,000 | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Self-Contained Breathing Apparatus (SCBA)

**Facepiece:** Helmet/hood

**Operating mode:** Pressure-demand or other positive-pressure mode (e.g., open/closed circuit)

**Assigned protection factor:** 10,000

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | | 4. Self-Contained Breathing Apparatus (SCBA) | | | | | | • Demand mode | | 10 | 50 | 50 | | • Pressure-demand or other positive-pressure mode (e.g., open/closed circuit) | | | 10,000 | 10,000 | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Full facepiece

**Operating mode:** Pressure-demand or other positive-pressure mode

**Assigned protection factor:** 1,000

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR) or Airline Respirator

**Facepiece:** Half mask

**Operating mode:** Pressure-demand or other positive-pressure mode

**Assigned protection factor:** 50

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline Respirator | | | | | | • Demand mode | | 10 | 50 | | | • Continuous flow mode | | 50 | 1,000 | 4 25/1,000 | 25 | • Pressure-demand or other positive-pressure mode | | 50 | 1,000 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Quarter mask

**Assigned protection factor:** 5

**Jurisdiction:** 29 CFR 1910.134

> Type of respirator 1 2 | Quarter mask | Half mask | Full facepiece | Helmet/hood | Loose-fitting facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | | |

Source: <https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Full facepiece

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 1,000

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>

Supplied-Air Respirator (SAR) — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Half mask

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Helmet/hood

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 25/1,000

**Jurisdiction:** Title 8, Section 5144

**Conditions:** The 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 Workplace Protection Factor (WPF) or simulated WPF 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.

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... | Pressure-demand or other positive-pressure | ...... | | 10,000 | 10,000 | ...... | mode (e.g., open/closed circuit). | | | | | | | Notes: | | | | | | 1. Employers 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. | | | | | | 2. The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section, including training, fit testing, maintenance, and use requirements. | | | | | | 3. This APF category includes filtering facepieces, and half masks with elastomeric facepieces. | | | | | | 4. The 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 Workplace Protection Factor (WPF) or simulated WPF 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.

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Loose-fitting facepiece

**Operating mode:** Continuous flow mode

**Assigned protection factor:** 25

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Self-Contained Breating Apparatus (SCBA)

**Facepiece:** Full facepiece

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>

Self-Contained Breating Apparatus (SCBA) — Respirator assigned protection factors — federal OSHA and Cal/OSHA, with maximum use concentrations


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Full facepiece

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Self-Contained Breating Apparatus (SCBA)

**Facepiece:** Half mask

**Operating mode:** Demand mode

**Assigned protection factor:** 10

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Half mask

**Operating mode:** Demand mode

**Assigned protection factor:** 10

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Self-Contained Breating Apparatus (SCBA)

**Facepiece:** Helmet/hood

**Operating mode:** Demand mode

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Full facepiece

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Full facepiece

**Assigned protection factor:** 1,000

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Half mask

**Assigned protection factor:** 10

**Jurisdiction:** Title 8, Section 5144

**Conditions:** This APF category includes filtering facepieces, and half masks with elastomeric facepieces.

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... | Pressure-demand or other positive-pressure | ...... | | 10,000 | 10,000 | ...... | mode (e.g., open/closed circuit). | | | | | | | Notes: | | | | | | 1. Employers 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. | | | | | | 2. The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section, including training, fit testing, maintenance, and use requirements. | | | | | | 3. This APF category includes filtering facepieces, and half masks with elastomeric facepieces. | | | | | |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Half mask

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Helmet/hood

**Assigned protection factor:** 25/1,000

**Jurisdiction:** Title 8, Section 5144

**Conditions:** The 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 Workplace Protection Factor (WPF) or simulated WPF 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.

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... | Pressure-demand or other positive-pressure | ...... | | 10,000 | 10,000 | ...... | mode (e.g., open/closed circuit). | | | | | | | Notes: | | | | | | 1. Employers 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. | | | | | | 2. The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this section, including training, fit testing, maintenance, and use requirements. | | | | | | 3. This APF category includes filtering facepieces, and half masks with elastomeric facepieces. | | | | | | 4. The 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 Workplace Protection Factor (WPF) or simulated WPF 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.

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Powered Air-Purifying Respirator (PAPR)

**Facepiece:** Loose-fitting facepiece

**Assigned protection factor:** 25

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Self-Contained Breating Apparatus (SCBA)

**Facepiece:** Full facepiece

**Operating mode:** Pressure-demand or other positive-pressure

**Assigned protection factor:** 10,000

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... | Pressure-demand or other positive-pressure | ...... | | 10,000 | 10,000 | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Full facepiece

**Operating mode:** Pressure-demand or other positive-pressure

**Assigned protection factor:** 1000

**Jurisdiction:** Title 8, Section 5144

> 2. A combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply. (B) Respirators provided only for escape from IDLH atmospheres shall be NIOSH-certified for escape from the atmosphere in which they will be used. (C) All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used. (3) Respirators for atmospheres that are not IDLH. (A) 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. 1. 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. Table 1. - Assigned Protection Factors 5 | | | | | | Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Supplied-Air Respirator (SAR)

**Facepiece:** Half mask

**Operating mode:** Pressure-demand or other positive-pressure

**Assigned protection factor:** 50

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Self-Contained Breating Apparatus (SCBA)

**Facepiece:** Helmet/hood

**Operating mode:** Pressure-demand or other positive-pressure

**Assigned protection factor:** 10,000

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... | 2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25 | 3. Supplied-Air Respirator (SAR) or Airline | | | | | | Respirator | | | | | | Demand mode | ...... | 10 | 50 | ...... | ...... | Continuous flow mode | ...... | 50 | 1,000 | 4 25/1,000 | 25 | Pressure-demand or other positive-pressure | ...... | 50 | 1000 | ...... | ...... | mode | | | | | | 4. Self-Contained Breating Apparatus (SCBA) | | | | | | Demand mode | ...... | 10 | 50 | 50 | ...... | Pressure-demand or other positive-pressure | ...... | | 10,000 | 10,000 | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>


**Respirator type:** Air-Purifying Respirator

**Facepiece:** Quarter mask

**Assigned protection factor:** 5

**Jurisdiction:** Title 8, Section 5144

> Loose- | | Quarter | | Full | | fitting | Type of respirator 1,2 | mask | Half mask | facepiece | Helmet/hood | facepiece | 1. Air-Purifying Respirator | 5 | 3 10 | 50 | ...... | ...... |

Source: <https://www.dir.ca.gov/title8/5144.html>