Originally Posted by
Greg Portland
Static pressure is the critical rating for shop vacs if you're connecting them to hand held tools, not CFM (like a large DC). Also, dropping a HEPA filter into a vacuum doesn't ensure that the entire system is HEPA rated.
The Rigid has lower static pressure ratings but higher CFM #s than Fein or Festool. This means that it is better suited for general shop cleanup & connecting to large tools (contractor saw, etc.) while the Fein and Festool are optimal for use with hand held equipment. I've noticed blow-through of dust on the Rigid (i.e. dust in the air after vacuuming) while the Fein and Festool keep the dust in the vac. Having said that, the Rigid is an excellent value for the $$$.