The chart below shows the noise measurements for zero and 605 RPM, 100 Meters from the exit on a west Southwest radial. At this position the distance as measured with a laser range finder to the exit is 120 yards, and 103 yards to the intake. The intake was making most of the noise heard from this position, the exit was contributing only high frequencies, probably from the air passing through the net.

In this picture, the intake can be seen to the left under the blue roof.