Velocity pressure and fan laws — Sim your flow

Convert air velocity to velocity pressure (Pv = ½ρv²) and predict how flow, pressure and power change with fan speed. Free in the browser.

What happens when you turn the speed down

A little less RPM still feels “almost the same”. Pressure drops faster, and power drops faster still — which is why it gets quieter and cheaper. Recalculate the flow and update the simulation instead of guessing.

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