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.

- First, determine the air velocity (m/s).
- Next, determine the air duct cross-sectional area (m^2).
- Next, gather the formula from above = DN = 10 + 50*LOG(V) + 10*LOG(A).
- Finally, calculate the Duct Noise.
- 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)** **= ?