What is the difference of scfm and cfm?
SCFM is the amount (volume) of air that would happen if your air
were at room temperature, and atmospheric pressure (0ft above sea
level, 14.7psi). CFM (cubic feet per minute) is the amount (volume)
of air that happens at the specific temperature and pressure.
example: if you have a balloon that happens to be one cubic foot,
and you are inside of a very hot, very high pressre room. when you
walk out of the hot room, the flow rate is 1CFM, but because it is
a balloon, when you take it outside the room it suddenly expands as
it adjusts to outside (close to standard) conditions. So your
balloon may be 3 or 4 SCFM. The two are interchangable, but when
working in an industry that used flow rates heavily, it's much
easier to note SCFM, because it has the added bonus of telling you
temperature and pressure along with flow rate.