Quote:
Originally Posted by AeroMcAeroFace
I would be inclined to agree with Julian here, but you could also tuft test the inlet instead of pressure tests. Pressure testing is better but not essential
It is possible, though unlikely that you could be getting reversed flow.
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Tuft testing will tell you airflow direction, but pressure testing will tell you airflow amount. Pressure testing will also tell you the results of small changes, eg I'd guess that adding a vertical forward projection to the outside edge of the opening would increase the pressure at the mouth of the duct.