In article fd80c.433565$na.1039251@attbi_s04, "Jay Honeck"
writes:

Immediately after this was done, I noticed our suction was lower than
before. It would top out in the 4.8 region -- at the very low end of the
acceptable scale.

With the Precise Flight Secondary Vacuum, they suggest that 3 inches will spin
the instruments. Where did you get the 4.8 and low end acceptable?

Chuck