anywhere from 1 to 5%.  depends on the quality of PSUs.

also you arent going to have enough cooling with wall A/C units for 200 S3's.  at a min of 330w each thats 66000 watts or 66kw.  that's equivalent to 225000 BTU/hr.  thats 15 - 25 wall/window units in order to counteract that heat generated.  plus an additional 20000 watts to power those.  and i dont even know if the window units would work properly for this large of an operation.

if you are doing a warehouse you should use large fans blowing out mounted on one side of the building and create negative pressure.