HVAC Noise Calculator

Estimate HVAC duct noise levels in a room from fan data, duct geometry, and fittings. Calculates sound power, duct attenuation, breakout noise, and NC rating.

Inputs

Fan static pressure (in. w.g.)

Airflow (CFM)

Duct width (in)

Duct height (in)

Duct length (ft)

Number of elbows

Room volume (ft³)

Tab to move between fields

Results

Fan sound power (dB)

Duct attenuation (dB)10

Room sound level (dB)54.3

Duct breakout noise (dB)33

Estimated NC rating47

Duct Area1

How to Use This Calculator

Enter Fan static pressure (in. w.g.), Airflow (CFM), and Duct width (in).
Set Duct height (in), Duct length (ft), and Number of elbows.
Adjust Room volume (ft³) as needed.
Review the Fan sound power (dB) result.
Use Duct attenuation (dB) and Room sound level (dB) to inform your decision.

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