Grill & Diffuser sizing calculator

Inputs

Results

CFM/Diffuser / Meter

0.00

Diffuser Size

N/A

Grill Area (ft²)

0.00

Grill W x H (in)

0 x 0

How to Use the Tool

  • Enter the **Total CFM** and the **NO. of Diffusers** to calculate the CFM per diffuser.
  • The **Velocity** and **Slot Diffuser Length** are used to calculate the CFM per meter.
  • Select a **Diffuser Size** from the dropdown menu to see the recommended output based on your CFM.
  • Enter the **Grill W (in)** and **Grill H (in)** to calculate the **Grill Area**.
  • The results update in real-time as you enter values.
  • Click the **"Print This Section"** button to get a clean printout of your current calculations.

Formulas Used

  • **CFM/Diffuser / Meter:** $CFM per Output = Total CFM / (NO. of Diffusers times Slot Diffuser Length)$
  • **Diffuser Size (for Squared and Round):** $Size = CEILINGleft(sqrt{frac{CFM per Output}{Velocity} times 144}, 3right)$
  • **Diffuser Size (for Slots):** A series of conditional `IF` statements based on the `CFM/Diffuser / Meter` value.
  • **Grill Area:** $Grill Area (ft^2) = CFM per Output / Velocity$
  • **Grill W x H:** The height is calculated based on the width and area: $Grill H = CEILINGleft(frac{Grill Area times 144}{Grill W}, 1right)$

Disclaimer

All calculations are estimates. For professional applications, consult a qualified engineer and refer to local codes and standards.