Nozzle No.	Orifice Size	Increase in Air Consumption
No. 4	1/4" (6.5mm)
No. 5	5/16" (8.0mm)	60% more than No.4
No. 6	3/8" (9.5mm)	38% more than No.5
No.7	7/16" (11.0mm)	36% more than No.6
No. 8	1/2" (12.5mm)	33% more than No.7