Using an automated breathing and metabolic simulator to test the performance of air-purifying respirators.
Beeckman-D; Turner-N; Campbell-D
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :80
We investigated the performance of two air-purifying respirators: a powered air-purifying respirator (PAPR) that featured a tight fitting neck-dam and a nosecup, and a NIOSH approved full-facepiece particulate filter respirator without a nosecup. Two PAPR units were tested at three simulated metabolic rates (MR1- 3) using an automated breathing and metabolic simulator (ABMS.) The units ran for 10 minutes at each simulated metabolic rate under two conditions that were as follows: blower power on (BPON) and blower power off (BPOFF). In condition BPON, the PAPR units' average fractional inspired oxygen concentration (FIO2) as a percentage did not dropped below 20%. Average fraction inspired carbon dioxide (FICO2) as a percentage was no greater than 0.50% during MR3. Minimum fraction inspired carbon dioxide (FICO2 min) was less than 0.05%, except for MR3 for one PAPR unit that averaged 0.23%. In condition BPOFF, the PAPR units' FIO2, varied from 16.90% +/- 0.01 to 18.52% +/- 0.01. The average FICO2 varied from 1.98% :t 0.03 to 3.69% +/- 0.01. The FICO2 min varied from 0.47"/0 +/- 0.01 to 1.82% +/- 0.03. Both FICO2 and FICO2 min tended to decrease with higher metabolic rates. The NIOSH approved full-facepiece respirator had an FIO2 that was 17.69% +/- 0.02 and 18.27% +/- 0.02 during MR1 and MR3 tests, respectively. The FICO2 was 2.78% +/- 0.03 and 2.21% +/- 0.04 during MR1 and MR3, respectively, and the FICO2, min was 1.04% +/- 0.01 and 0.29% +/- 0.01 during the MRl and MR3 tests, respectively. These tests of a neck-dam PAPR and a NIOSH approved full-facepiece respirator demonstrated the usefulness of the ABMS as a tool to evaluate the performance of air-purifying respirators.
Respirators; Respiratory-equipment; Air-purifying-respirators; Testing-equipment; Metabolic-rate; Equipment-design; Equipment-reliability; Performance-capability; Simulation-methods; Face-masks; Breathing; Oxygen-uptake
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia