Enter the air velocity (m/s) and the air duct cross-sectional area (m^2) into the Duct Noise Calculator. The calculator will evaluate the Duct Noise. 

Duct Noise Formula

The following two example problems outline the steps and information needed to calculate the Duct Noise.

DN = 10 + 50*LOG(V) + 10*LOG(A)

Variables:

  • DN is the Duct Noise (dB)
  • V is the air velocity (m/s) 
  • A is the air duct cross-sectional area (m^2) 

How to Calculate Duct Noise?

The following steps outline how to calculate the Duct Noise.

  1. First, determine the air velocity (m/s). 
  2. Next, determine the air duct cross-sectional area (m^2). 
  3. Next, gather the formula from above = DN = 10 + 50*LOG(V) + 10*LOG(A).
  4. Finally, calculate the Duct Noise.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

air velocity (m/s) = 2.35

air duct cross-sectional area (m^2) = 1.25

DN = 10 + 50*LOG(V) + 10*LOG(A) = ?