Very well put Kelly. Just like compressors, multi stage blowers, well designed, achieve higher pressure at better efficiency than single stage but with blowers the design work is so well advanced efficiencies are about to theoretical limits. I do disagree on your 220v comment and would like confirmation either way so I don't make a mistake. My assumption has always been if you run a 220 circuit to two blowers and have one on one leg and the other on the other leg you will get 15 amps in the neutral when only one is running and close to zero on the neutral when both are running. Am I wrong there?