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Correlation between quantitative fit factors and protection factors measured under actual workplace environments at a steel foundry.

11th ISRP International Conference, 2002 Sep-Oct :1
Past studies have found little to no correlation between workplace protection factors and quantitative fit factors (FFs). The purpose of this new study was to investigate the correlation between FFs and protection factors (PF) for half-facepiece, air-purifying respirators under actual workplace environments at a steel foundry. Fifteen burners, welders, and chippers wore two respirator models. Each worker donned a respirator twice per day for two days. Quantitative FFs were first obtained for each donning using the PortaCount Plus in a separate room. Without redonning the respirators, workers performed normal work for one to two hours, and protection factors were measured by collecting ambient and in-facepiece samples simultaneously. A second fit-test was conducted without redonning the respirator. Fit factors were obtained by averaging the results from the first and second fit-tests. The resulting FFs had a geometric mean (GM) of 400 (range=1 0-601 0) and a geometric standard deviation (GSD) of 6.1. The protection factors had a GM of 920 (range=13-230000) and a GSD of 17.8. The protection factors were found to be significantly correlated with the FFs (R2=0.55 and p-value=0.0001). This field study has, therefore, shown fit factor to be a meaningful indicator of respirator performance under actual workplace environments.
Quantitative-analysis; Work-environment; Steel-foundries; Steel-industry; Respirators; Respiratory-protection; Respiratory-protective-equipment; Air-purifiers; Air-purifying-respirators; Personal-protective-equipment
Publication Date
Document Type
Conference/Symposia Proceedings; Abstract
Fiscal Year
NTIS Accession No.
NTIS Price
NIOSH Division
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
International Society for Respiratory Protection 11th International Conference, Edinburgh, Scotland, September 29 - October 3, 2002