Blast System Air Volume Estimates
| Nozzle | Size of Orifice | Volume of Air | Plus Helmet | Plus 50% (reserve) | Minimum Air Required |
| No. 4 | 1/4″ 6.5mm | 81 2.3 | 20 0.5 | 50 1.4 | 151 cfm 4.2 m3/min |
| No. 5 | 5/16″ 8.0mm | 137 3.9 | 20 0.5 | 79 2.2 | 236 cfm 6.6m3/min |
| No.6 | 3/8″ 9.5mm | 196 5.5 | 20 0.5 | 108 3.0 | 324 cfm 9.0 m3/min |
| No. 7 | 7/16″ 11.0mm | 254 7.2 | 20 0.5 | 137 3.9 | 411 cfm 11.6 m3/min |
| No. 8 | 1/2″ 12.5mm | 338 9.6 | 20 0.5 | 179 5.0 | 537 cfm 16.1 m3/min |