Research Article
Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators
Table 1
Summary of results.
| Respirator | Blower flow rate (L/min) | Exhaled volume (L) | CO2 ratio | Wearer protection factor | Leakage volume (L) | Inhaled volume (L) | Blower contribution (L) | Total blower volume (L) | Blower effectiveness |
| Racal PAPR | 191–200 | 2.41 | 0.84 | 1.2 | 2.02 | 2.66 | 0.43 | 2.42 | 0.18 | Centurion PAPR | 88–101 | 2.37 | 0.25 | 4 | 0.60 | 2.66 | 1.99 | 1.17 | 1.70 | 3M hood PAPR | 157–161 | 2.39 | 0 | | 0 | 2.63 | 2.63 | 1.87 | 1.41 | 3M PAPR | 121–278 | 2.42 | 0 | | 0 | 2.62 | 2.62 | 2.51 | 1.04 | SE 400 PAPR | 64–322 | 2.32 | 0 | | 0 | 2.58 | 2.58 | 2.90 | 0.89 | SE 400 APR (blower off) | (0–284) | 2.37 | 0.048 | 21 | 0.11 | 2.58 | 2.46 | 2.50 | 0.98 | FRM 40 APR | 0–289 | 2.37 | 0.057 | 18 | 0.14 | 2.62 | 2.47 | 2.51 | 0.99 |
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