System Size
Tonnage
1,200 CFM
Return Air
Supply Air Ducts
LIVE CAPACITY ANALYSIS
System Running At
—
Add ducts above to calculate
Return CFM
—
CFM
Supply CFM
—
CFM
Target CFM
—
CFM
Awaiting Input
Select the system tonnage and add duct sizes above to calculate true operating capacity.
Reference: Duct Design & Airflow Chart
| Duct Size | Design CFM |
|---|
| Tons | Req. CFM |
|---|---|
| 1 Ton | 400 |
| 2 Ton | 800 |
| 3 Ton | 1,200 |
| 4 Ton | 1,600 |
| 5 Ton | 2,000 |
Round duct CFM values are taken directly from the Duct Design & Airflow Calculations chart. Platform return uses L × W ÷ 144 × 400. The bottleneck side determines actual system output.