Quote:
Originally Posted by Zwerius
...I had the opportunity to borrow a flow-measuring device that's intended to measure airflows from ventilationsystems (TSI Velocicheck including air capture hood).
In this way I was able to measure each separate supply nozzle and extraction nozzle and after that, I could adjust the nozzles so that incoming and outgoing air were really balanced.
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Yeah, when I was working with Mike, he had a similar instrument, and we were measuring airflow from a duct opening. He measured at the edges and the center and various other places in between, and it was clear that the velocities were quite different across the opening. To get real volumetric accuracy, some averaging was needed.
The bag method takes care of those differences.
But if you only want to balance velocities, I suppose a center measure would do it.
-AC