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 |