mine ventilation acoustic assesment|Predicted sound pressure levels of return air outlets|300
![||||Fig. 1. Predicted Sound Pressure Levels [dBA] of Return Air Outlet with Directivities Calculated from Textbook|Fig. 3. Predicted Sound Pressure Levels [dBA] of Return Air Outlet with Measured Directivity Pattern – 300](https://acoustical-consultants.com/wp-content/uploads/2019/02/mine-ventilation-acoustic-assesment.png)
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