| Component | Qty | Length (ft) | Size | CFM | Loss Coefficient | VP | Loss (in.w.c.) | |-----------|-----|-------------|------|-----|------------------|----|----------------| | Supply: 18" round | 1 | 20 | 18" | 2000 | 0.018 (friction) | - | 0.032 | | Elbow, 90°, R/D=1 | 2 | - | 18" | 2000 | 0.21 | 0.12 | 0.050 | | Tee, branch | 1 | - | 18"x12" | 1200 | 0.90 | 0.10 | 0.090 | | Flex duct (2x friction) | 1 | 60 | 12" | 600 | 0.036 per ft | - | 0.216 | | Diffuser | 1 | - | 12x12 | 600 | - | - | 0.050 | | | | | | | | | 0.438 | | Return: 20" round | 1 | 15 | 20" | 2000 | 0.012 per ft | - | 0.018 | | Return grille | 1 | - | 24x24 | 2000 | - | - | 0.040 | | Return Subtotal | | | | | | | 0.058 | | Total ESP | | | | | | | 0.496 in.w.c. |
Note: Always use manufacturer data where available. esp calculation hvac excel sheet
Key columns for Fittings tab: