Duct-Generated Noise Calculator

Calculate sound power level generated by air flowing through ductwork based on velocity and duct characteristics.

Round diameter or equivalent diameter
inches
Mean velocity in duct
FPM
Length of duct section
feet
1=Unlined, 2=Lined (1" fiberglass)

Results

Sound Power Level @ 500 Hz-dB
Sound Power Level @ 1000 Hz-dB
Overall Sound Power Level-dB
References: ASHRAE Fundamentals Ch. 49 - Noise and Vibration Control, ASHRAE TC 2.6 Sound and Vibration