Diffuser Sizing Calculator

Input Parameters

Imperial (°F, BTU, ft)SI (°C, kW, m)

Airflow (CFM)

Throw Distance (ft)

Diffuser Type

Diffuser Size

Neck Size in

Throw Velocity FPM

Neck Size8.56 in(100%)

Throw Velocity8.33 FPM(1%)

Formula:

D_{neck} = 2\sqrt{\frac{CFM}{\pi \times V_{neck}}}

Calculation:

D_{neck} = 2\sqrt{\frac{200}{\pi \times 500}}

Result:

8.56 \text{ in}