Need help calculating Reynolds number

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How do I calculate calculate Reynolds number for airflow in a rectangular speaker port?

Aerodynamics, from Greek ἀήρ aero (air) + δυναμική (dynamics), is the branch of fluid mechanics which studies the motion of air, particularly when affected by a solid object. It is a core part of science and engineering, from cars, aircraft and engines, to buildings and bridges, to atmospheric science, sports science and even throughout biology.

REYNOLDS CALCULATION HELP

Aerodynamics, from Greek ἀήρ aero (air) + δυναμική (dynamics), is the branch of fluid mechanics which studies the motion of air, particularly when affected by a solid object. It is a core part of science and engineering, from cars, aircraft and engines, to buildings and bridges, to atmospheric science, sports science and even throughout biology.