If memory serves, though it frequently swerves, the air test
results came back partially inconclusive, though enough crap was detected to
warrant installation of a louvered ceiling fan up past the girders toward the roof ridge line.
The tale of the tape would have pegged that fan at around 20” – hardly sufficient for a facility of this size – more along the lines of a homeowner's attic fan.
As an aside, aside from the fact that the CFM capacity of this rotating air handling device was woefully inadequate for the task at hand, it crapped up within a couple of weeks.