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Engineering ToolBox > Blade Pass Frequency - BPF
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
A fan rotates with 2400 rpm. The number of blades is 10. The BPF can be calculated as
BPF = 2400 10 / 60
= 400 Hz