What gas/air pressure and flow rate should I use?
Use only clean, dry, oil-free air with a pressure of 90-120 PSI (621-827 kPa) and a flow rate of 6.0 SCFM (170 L/min). Air must be filtered to 5 microns or better. Insufficient airflow can lead to torch overheating, so proper pressure and volume settings are essential.
From the official Miller Spectrum 625 Plasma Cutter manual, page 12
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