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An Overview of Air-Purifying Respirators

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Presentation on theme: "An Overview of Air-Purifying Respirators"— Presentation transcript:

1 An Overview of Air-Purifying Respirators
Prepared by CPWR the Center for Construction Research and Training CPWR research project

2 The hierarchy of controls has underpinned industrial hygiene control efforts for a long time
Elimination Substitution Modification Containment Ventilation Work Practices PPE More reliance on workers Adapted from

3 Is there an OSHA standard for respirators?
Yes! General Industry 29 CFR Construction: 29 CFR Respiratory regulation may be contaminant specific

4 What is required in a written respiratory protection program?
Respirator selection Medical evaluation Fit testing Proper procedures for routine and emergency use Proper inspection, cleaning, maintenance, and storing Training Program evaluation

5 Respirators can be divided based on facial coverage
Full-face half-face

6 A key difference is the pressure inside the mask when inhaling
Negative pressure Positive pressure

7 Powered air purifying respirators filter air, but keep a positive pressure in the face-piece
PAPRs with tight fitting facepiece PAPR with loose fitting hood PAPR with loose fitting facepiece for welding

8 Air purifying respirators filter out dusts AND vapors
Must have the correct color-coded cartridge and it must be NIOSH-approved

9 Cartridges to protect against silica exposures are magenta
Color Type Protection against Magenta, purple High Efficiency Particulate Air (HEPA) Silica dust, asbestos fibers, lead particles Black Organic vapor Solvents Yellow Organic vapor and acid gases Brick cleaners

10 NIOSHs categories of particulate filters are based on oil mist degradation
Not resistant R Resistant P Protective against

11 Particulate filters are further classified base on efficiency
95 percent, designated 95 99 percent, designated 99 99.97 percent, designated 100 (HEPA filter)

12 This gives 9 categories of particulate respirators
N R P 100 99 95

13 Method of particle capture
Courtesy Roland Berry Ann, NIOSH

14 What is the most penetrating particle size?
Efficiency . Particle diameter Courtesy Roland Berry-Ann, NIOSH

15 OSHA requires that workers pass a fit test before wearing a respirator
Quantitative Qualitative PortaCount Quantitative Fit Testing System Courtesy TSI, Inc. Allegro Complete Smoke Fit Test Kit Photo Courtesy Gempler’s

16 User seal checks must be performed before each use
Negative pressure check Positive pressure check Image courtesy IUOE Hazmat Program and Robert Harrold

17 Storage and maintenance of respirators are often neglected

18 Cleaning is important and easy
Follow manufacturers recommendations Use warm water and mild soap Air dry

19 Questions? Bruce Lippy, Ph.D., CIH, CSP
CPWR’s Director of Safety Research (direct line)

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