guage units?

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Just curious. I have five shield gas regulators and just recently noticed that some are marked CFH and others marked Scfh. I have revisited my machines manuals and a few text books but cannot find any mention of the "S". Can anyone clue me in?Miller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180
Reply:Standard Cubic Feet Per Minute. Why the Standard , for someone that doesn't like an automatic I guess :-). I think I had read somewhere standard depicts a set set of standards such as relative air temperature, atmospheric pressure, humidity etc.....Mike
Reply:Standard Cubic Feet Per Minute.I think MrMikey meant to say 'feet per hour.'pgDynasty 200 DX_set up to run on 3 phaseCoolmate 3MM 251 w/ Spoolmatic 30AHTP 625 Micro Cut Plasma CutterVictor O/A RigBridgeport Mill_3 phase10 inch South Bend Lathe_3 phaseQuincy 325 2 Stg. Air Compressor_3 phase
Reply:I think MrMikey meant to say 'feet per hour.
Reply:Originally Posted by mrmikeyStandard Cubic Feet Per Minute. Why the Standard , for someone that doesn't like an automatic I guess :-). I think I had read somewhere standard depicts a set set of standards such as relative air temperature, atmospheric pressure, humidity etc.....Mike