by wisepeppy » Thu Nov 20, 2008 3:30 am
mm WG is "millimeters water gauge" which is a pressure.
SFPM, from what I can tell, is "surface feet per minute", which is the relative linear speed of the edge of a rotating circle (wheel, spindle, etc.)
You might as well be asking, "How do I convert psi to mph?"
If this is not the case, then you need to provide more information.
Some would say there's no such thing as a stupid question, but sometimes I wonder.