Type Power source Fundamental frequency, Hz IMO minimum required 1/3 rd octave band level at 1m, db IMO required
fundamental
frequency, Hz
AT 150/130 Air-driven 130 138 130-350
AT 150/165 Air-driven 165 138 130-350
MT 150/130 Electrically driven 130 138 130-350
MT 150/140 Electrically driven 140 138 130-150
AT 150/200 Air-driven 200 138 130-350
AT 150/330 Air-driven 330 138 130-350
 TK 80 Contactor unit

 

 

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