Blade Passing Frequency

The number of blades and the rotational rate in rpm determine the frequency of the pure tone. (ACGIH 1998)

Formula

  • f = (N)(RPM)/60
Variable Unit
N Number of fan blades
RPM Revolutions per minute

Blade Passing Frequency

f = (N)(RPM)/60
f
= (
N
) (
RPM
) / 60

Digits of Precision:

#
rpm