assigned protection factor (apf) respiratory protection ... · respiratory protection standard 29...

Assigned Protection Factor (APF) Table Added to OSHA’s

Respiratory Protection Standard29 CFR 1910.134

John Steelnack, Project OfficerOSHA Directorate of Standards & Guidance

Roundtable 243, AIHce - 2007June 5, 2007

Respiratory Protection Final RuleJanuary 8, 1998

Reserved APF issues for later rulemaking● Definitions

Assigned Protection FactorMaximum Use Concentration

● Selection of Respirators(d)(3)(i)(A) – Assigned Protection Factors(d)(3)(i)(B) – Maximum Use ConcentrationTable 1 – Assigned Protection Factors

History of APF Rulemaking

● Respiratory Protection Final RuleJanuary 8, 1998

● Assigned Protection Factor NPRMJune 6, 2003

● APF Public Hearings in Washington, DCJanuary 28 – 30, 2004

● Assigned Protection Factors Final RuleAugust 24, 2006

APF Final Rule Federal Register Notice

TABLE 1 – Assigned Protection Factors

——

5010,000

5010,000

10—

——

4. Self-Contained Breathing Apparatus (SCBA)

• Demand mode• Pressure-demand or

other positive-pressure mode(e.g., open/closed circuit)

—25—

—25/1,0004

—

501,0001,000

105050

———

3. Supplied-Air Respirator (SAR) or Airline Respirator

• Demand mode• Continuous flow mode• Pressure-demand or other

positive-pressure mode

2525/1,00041,00050—2. Powered Air-Purifying Respirator (PAPR)

——5010351. Air-Purifying Respirator

Loose-FittingFacepiece

Helmet/Hood

FullFacepiece

HalfMask

QuarterMask

Type of Respirator1, 2

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.

5010351. Air-Purifying Respirator

FullFacepiece

HalfMaskQuarter

MaskType of Respirator1, 2

TABLE 1 – Assigned Protection Factors5

APF of 5 for Quarter Masks

● Only available APF data by Hyatt in 1976

● Quarter masks given a PF of 5 in LASLRespirator Protection Factors Table

● No new WPF or SWPF studies since Hyatt


FullFacepieceHalf

MaskQuarterMask


Half Mask respirator category includes:

● Filtering Facepiece Respirators

● Half Masks with Elastomeric Facepieces

TABLE 1 – Assigned Protection Factors5

APF of 10 for Half Masks

APF of 50 for Full Facepieces


FullFacepiece

HalfMask

QuarterMask


TABLE 1 – Assigned Protection Factors 5

● APF of 50 supported by

○ WPF study by Colton, Johnston, Mullins and Rhoe

○ Corresponds to APF previously assigned in

substance specific standards

○ Achieved with N95 filters in WPF and SWPF studies

APF of 50 for Half Mask PAPR

2525/1000 41,000502. Powered Air-PurifyingRespirator (PAPR)

Loose-Fitting Facepiece

Helmet/HoodFull FacepieceHalf Mask

Type of Respirator1,2


● NIOSH 1987 RDL gave APF of 50

● ANSI Z88.2-1992 assigned an APF of 50

● Lenhart and Campbell WPF study

supports APF of 50

APF of 1,000 for Full Facepiece PAPR



Helmet/HoodFull Facepiece

Half MaskType of Respirator1,2


● Colton and Mullins WPF study reported a corrected 5th Percentile Protection Factor of 1,335

● ANSI Z88.2-1992 listed an APF of 1,000

APF of 25 / 1000 4 for Helmet/Hood PAPR



Helmet/Hood

Full FacepieceHalf MaskType of Respirator1,2


SWPF or WPF testing has been used to determine reliable APF values

● ORC – LLNL pharmaceutical industry SWPF study as example demonstrating APF of 1,000

● Footnote 4 to APF Table revised to reflect this

No single parameter will identify hoods or helmets that achieve high APFs

● Not positive pressure inside the facepiece● No agreement on design characteristics● No uniform testing criteria established

APF of 25 / 1000 4 for Helmet/Hood PAPR

APF Table - Footnote 4

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.

APF of 25 for Loose-FittingFacepiece PAPR



Helmet/HoodFull Facepiece

Half Mask



APF of 25 based on

● WPF study by Myers

● NIOSH 1987 RDL

● ANSI Z88.2-1992

APFs for Supplied-Air Half Mask Respirators

—25—

—25/1,0004

—

501,0001,000

105050





Helmet/Hood

FullFacepiece

HalfMask



APFs based on analogous performance to:

● Negative pressure half mask WPF and SWPF studies

● Half mask PAPR performance in WPF and SWPF studies

APFs for Supplied-Air Full Facepiece Respirators

—25—

—25/1,0004

—

501,0001,000

105050





Helmet/Hood

FullFacepiece

HalfMask



APFs based on analogous performance compared with:

● Demand mode full facepiece WPF studies

● Continuous flow, or pressure-demand mode APFs

based on SWPF study, and ANSI Z88.2-1992

APFs for Supplied-Air Helmet / Hood Respirators

—25—

—

25/1,0004

—

501,0001,000

105050





Helmet/Hood

FullFacepiece

HalfMask



APF is based on WPF and SWPF studies

● Must demonstrate performance at APF of 1,000

as stated in Footnote 4

● Absent such testing, they get an APF of 25

APFs for Loose - Fitting Supplied-Air Respirators

—

25—

—25/1,0004

—

501,0001,000

105050




Loose-Fitting

Facepiece

Helmet/Hood

FullFacepiece

HalfMask



APF based on:

● Analogous performance to loose-fitting PAPRs

● ANSI Z88.2-1992 and NIOSH 1987 RDL values

APFs for Self-Contained Breathing Apparatus (SCBA)

——50

10,00050

10,00010—

4. Self-Contained Breathing Apparatus (SCBA)

• Demand mode• Pressure-demand or

other positive-pressure mode(e.g., open/closed circuit)


Helmet/Hood

FullFacepiece

HalfMask



APFs for demand mode SCBAs set based on analogous operation to half mask and full facepiece APRs

APF for pressure demand SCBAs based on WPF and SWPF studies and NIOSH RDL and ANSI Z88.2-1992 values

assigned protection factor (apf) respiratory protection ... · respiratory protection standard 29...

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