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WORKING DRAFT 9.15.92—Performance Evaluation of DM and DFM Filter Respirators
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failure rate. This statistical analysis for WPF data is both informative and relevant from a public health standpoint.
  NIOSH performed this statistical analysis for some published and unpublished WPF data sets reported for non-powered, air-purifying halfmasks over the last decade. This evaluation included studies by Galvin et al.,[1] Gaboury and Burd,[2] Nelson and Dixon,[3] Lenhart and Campbell,[4] Colton and Mullins,[5] Colton et

al.,[6] Johnston and Mullins,[7] Gosselink et al.[8] and Dixon and Nelson.[9] Since this respirator class currently has an accepted APF of 10 for professional practice (i.e., 10% or less leakage at the face seal only), the results of NIOSH’s control failure-rate analysis for these halfmasks against this APF of 10 are given in Table O of this evaluation.
  In addition to sampling errors, the results in presented in Table O also need to be examined with regard to their external validity limitations.[10] That is, the

  1. ↑ Galvin, K., S. Selvin, and RC. Spear: Variability in Protection Afforded by Half-Mask Respirators Against Styrene Exposure in the Field, Am. Ind. Hyg. Assoc. J. 51:625-639 (1990).
  2. ↑ Gaboury, A. and D. H. Burd: Workplace Protection Factor Evaluation of Respiratory Protective Equipment in a Primary Aluminum Smelter, presented at the International Society for Respiratory Protection Conference, San Francisco, CA (November 1989).
  3. ↑ Nelson, T. J. and D. H. Burd: Respirator Protection Factors for Asbestos, Parts I and II, paper presented at the 1965 American Industrial Hygiene Conference, Las Vegas, Nevada (May 23, 1985).
  4. ↑ Lenhart, S.W. and D. L. Campbell: Assigned Protection Factors for Two Respirator Types Based Upon Workplace Performance Testing, Ann. Occup, Hyg. 28(2):173-182 (1984).
  5. ↑ Workplace Protection Factor Tests—Brass Foundry, paper persented at the 1990 American Industrial Hygiene Conference, Orlando, Florida (May 1990).
  6. ↑ Colton, C. E., A. R Johnston, H. E. Mullins, and C. R. Rhoe: Respirator Workplace Protection Factor Study on a Half Mask Dust/Mist Respirator, paper presented at the 1990 American Industrial Hygiene Conference, Orlando, Florida (May 17, 1990).
  7. ↑ Johnston, A. R. and H. E. Mullins: Workplace Protection Factor Study for Airborne Metal Dusts, Paper presented at the 1967 American Industrial Hygiene Conference, Montreal, Canada (June 4, 1987).
  8. ↑ Gosselink, D. W., Wilmes, D. P, and Mullins, H. E.: Workplace Protection Factor Study for Airborne Asbestos (a.k.a. The Shiloh Brake Study conducted by representatives of the SM Company); presented at the American Industrial Hygiene Conference, Dallas, Texas (May 1986).
  9. ↑ Dixon, S.W. and T. J. Nelson: Workplace Protection Factors for Negative Pressure Half-Mask Facepiece Respirators, J. Int. Soc. Respir. Prot. 2(4):347-381 (1964).
  10. ↑ That is, the problems inherent in attempting to generalize from sample results to populations of respirator wearers. Refer to discussion for external validity presented in this evaluation under Review and Evaluation of Professional Practices Used during the 1970s and 1980s for Respirator Faceseal Evaluations and APF Determinations.
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