E-450-ATF240 CNG Powered

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Exterior Noise Test

Accelerating from Standstill

Date : 2012-05-25
Personnel : B.L., T.S. & J.S.
Temperature (°F) : 71 Humidity (%) : 75
Wind Speed (mph) : 9.2 Wind Direction : SSW
Barometric Pressure (in.Hg) : 30.13
Verify that microphone height is 4 feet, wind speed is less than 12 mpg and ambient temperature is between 30 F and 90 F: true checked by B.L.
Initial Sound Level Meter Calibration: true checked by B.L.
Exterior Ambient Noise Level dB(A): 39.1

Accelerating from Constant Speed
Curb (Right) Side
Accelerating from Constant Speed
Street (Left) Side
Run # Measured Noise Level dB(A) Run # Measured Noise Level dB(A)
1 77.3 1 77.7
2 78.0 2 75.2
3 75.6 3 75.5
4 75.7 4 74.0
5 76.1 5 74.7
Average of two highest actual noise levels = 77.7 dB(A) Average of two highest actual noise levels = 76.6 dB(A)