| Temp. | Flow rate (lpm) | ns (m−2) Total filter | ns (m−2) PM0.5 (Cyclone filter) |
| −18˚C | 2 | 1.6 × 108 (0.3 × 108) | 2.2 × 108 (0.3 × 108) |
| −22˚C | 2 | 5.2 × 108 (1.0 × 108) | 7.6 × 108 (1.4 × 108) |