ed and NIOSH-funded research at the Los Alamos Scientific Laboratory (LASL).[1],47,48,49,50,51 Hyatt stated in 1977 that "These [1976] respirator protection factor values are based on quantitative fit tests with Bureau of Mines' approved respirators on men during the period 1971 through 1973. "52 Hyatt also stated in 1977: New quantitative fit test data on NIOSH/MESA approved respirators made with male and female test panels representative of the facial sizes of the U. S. adult workers during the past three years is available and has been reviewed by several investigators. My analysis of this new data indicates that the respirator protection factors in the [Joint NIOSH/OSHA Standards Com- pletion Program, 1975] "Respirator Decision Logic" should be reviewed and revised.... Respirator protection factors in the "Respirator Decision Logic" recommends a protection factor of 10 for quarter-mask and half-mask facepieces and 50 for full facepiece respirators operated with a negative pressure during inhalation.... The new respirator fit test data demonstrates that full facepiece respirators now available should be assigned a protection factor of 100 for men. However, this (sic) data indicates (sic) that the protection factor for women should be re- duced.... My recommendation for an interim solution is to assign a protection factor of 10 for quarter mask and half-mask facepieces and 100 for full facepiece devices operated with a negative pres sure in the facepiece for men only. For women respirator users, I recommend a protection factor of 5 for quarter-mask and half-mask facepieces and 50 for full facepieces operated with a nega
17Hyatt E. C. et al.: Respiratory Studies for the National Institute for Occupational Safety and Health July 1, 1972 through June 3, 1973, Los Alamos Scientific Laboratory, Progress Report, No. LA-5620-PR (May 1974). "Held, B. J. et al.: Respirator Studies for the National Institute for Occupational Safety and Health July 1, 1973 through June 30, 1974, Los Alamos Scientific Laboratory, Progress Report,
- LA-6805-PR (December 1974).
Douglas, D. D. et al.: Respirator Studies for the National Institute for Occupational Safety and Health July 1, 1974-June 30, 1975, Los Alamos Scientific Laboratory, Progress Report, No. LA-6386-PR (August 1976). 50 Lowry, P. L. et al.: Respirator Studies for the National Institute for Occupational Safety and Health July 1, 1975-December 31, 1976, Los Alamos Scientific Laboratory, Progress Report, No. LA-6722-PR (February 1977). 5/Lowry, P. L. et al.: Respirator Studies for the National Institute for Occupational Safety and Health January 1-December 31, 1977, Los Alamos Scientific Laboratory, Progress Report, No. LA-7317-PR and HEW publication No. (NIOSH) 78-161 (June 1978).
Hyatt, E. C.: Letter to J. F. Finkles of NIOSH, Los Alamos, New Mexico (September 14, 1977).
- ↑ Hyatt E. C. et al.: Respirator R and D Related to Quality Control; LASL Project P-37, Los Alamos Scientific Laboratory, Quarterly Report July 1 thru September 30, 1971, No. LA-4908-PR (March 1972).
