This presentation describes a study that compared a detailed grid survey using a hot wire anemometer against a digital and analog vane anemometers and smoke tubes. The digital and analog vane anemometers were used to traverse the airway cross section to achieve an average velocity. The study was performed to determine any differences between the instruments. In addition, a grid survey was compared with smoke tube measurement techniques in low velocity airways. The results indicate that a detailed grid survey, in general, gives lower velocity averages than the traverse methods, which may reflect that a grid survey better represents the low flow boundary conditions than instruments using the traverse method. When comparing the results, the grid method is a more accurate technique to quantify flows in low velocity airways.
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