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An Overview of Air-Purifying Respirators

An Overview of Air-Purifying Respirators. Prepared by CPWR the Center for Construction Research and Training. CPWR research project. The hierarchy of controls has underpinned industrial hygiene control efforts for a long time. More reliance on workers.

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An Overview of Air-Purifying Respirators

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  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 More reliance on workers

  3. Is there an OSHA standard for respirators? • Yes! • General Industry 29 CFR 1910.134 • Construction: 29 CFR 1926.103 • 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. Positive pressure A key difference is the pressure inside the mask when inhaling Negative 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

  10. NIOSHs categories of particulate filters are based on oil mist degradation

  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

  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. PortaCount Quantitative Fit Testing System Courtesy TSI, Inc. OSHA requires that workers pass a fit test before wearing a respirator Quantitative Qualitative 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 blippy@cpwr.com 301-495-8527 (direct line)

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