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Using WinISD, port air speed with 600 watts input would be 21 m/s at 20 hz, 29 m/s at 15 hz and peaks at 33 m/s at 11 hz. The port dimensions are wide and narrow, not the best for air flow. Changing the dimensions to 3" by 9" by 27" long would be a better choice. It will help with air flow and has a slightly larger surface area to reduce air speed.
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