i have an apc computer room supplied by others and asked to be piped by us by the contractor that we did the hvac for the rest of the complex for, and the apc startup techs demand 300 microns before starting system. can 300 microns be achieved with a 2 stage 6 cfm vacuum pump? we do mainly residential and light commercial a/c and aren't familiar enough about microns to give a supported opinion. i don't believe this is possible but, what do i know?