Blade Pass Frequency - BPF

The noise level intensity varies with type of fan

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The noise level intensity will vary with type of fan and can be expressed as

BPF = ω t / 60 (1)

where

BPF = Blade Pass Frequency (Hz)

ω = rotation velocity (rpm)

t = number of blades

Example - Blade Pass Frequency of Fan

A fan rotates with 2400 rpm. The number of blades is 10. The BPF can be calculated as

BPF = 2400 10 / 60

= 400 Hz

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