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Lets say we have a square sheetmetal duct 12" x 12"
If the corners had a radius Vs square would airflow improve?
Say r of 0.5" or 1" or 1.5"
Or is the gain negligible such that the extra difficulty in fabrication is not worth the effort?
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86 911 Race Car, with a few 993 bits in the boiler room
79 928 Race Car
88 928 Becoming a Race Car
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