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Side Branch Orifice The side branch orifice is an acoustic filter element and behaves as a high pass filter.
- The transmission loss of a side branch orifice is:
 - where
- a = radius of main duct [m]
- ab = radius of side branch [m]
- L = length of side branch [m]
- L' = effective length of side branch, taking into account the end correction [m]
 - if the hole is just a hole in the pipe then it will have an effective length equal to 1.7ab
- k = wavenumber [m-1]
See also: Acoustic Filter Elements, Helmholtz Resonator, Quarter Wave Tube.
  
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