Look's like lousy weather will come in on Sunday. So, i'll assemble the plenum, sides and bottom of the air box. Once the plenum is in the air box i won't have easy access to the orifice disc. So, i measured and tabulated all the holes in the orifice disc today. The table shows all the measurements and the number and average size of all the holes. Later on, these measurements will be used to calibrate the flow bench and to calculate flow rates from the measured pressure drops.