I am using the P45 here over in the Netherlands/ Europe. What a fabulous machine indeed. Although Hypertherm mentions that the P45 may run on “shop air” the specifications for air contamination are quite strict. I made every precaution to get my air clean: a water separator, a pre-filter for 0.1 micron particals, a refrigerator airdryer and a as a last stage a0.01 partikal filter. Fortunately I could lay my hands on a second hand refrigerator airdryer through our local ebay.
As specified by Hypertherm, clean air improves your cut quality en extends consumable life. I learned the hard (expensive) way: I started out with cnc plasma with a entry level italian machine with only a water separator on my compressor. What a load of rubbish….