M700 Heatsink Fan Acoustic Noise Levels

The measured acoustic noise levels were measured in accordance with standard ISO 3744-1994

Standard and Specifications
The standard ISO 3744 -1994 requires defining the measurement surface envelope for the sound
pressure level and the testing points; typically we need 6 testing points on the envelope surface.
The standard has a clear explanation to how to define the envelope and testing points, and also it
defines the correct way to calculate the final result.