My Hypertherm 45 has a built in air regulator.
Previous thread with my pics.
http://talk.newagtalk.com/forums/thread-view.asp?tid=272526Couple replies from Jim Colt at Hypertherm also.
Most important is to protect machine from moisture.
A motor guard filter is most important. I actually run a Sharpe water separator then into the motor guard filter then into the machine. Might be overkill but moisture can wreck the consumables.