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

Available Literature: