Table 4: Variables for various fan blades considered in this work.
| Items | Original fan blade | Optimal fan blade | Range |
|---|---|---|---|
| Blade root chord (Lr, mm) | 25.0 | 25.2 | 24.5-25.5 |
| Blade end chord (Le, mm) | 40.0 | 41.0 | 39.0-41.0 |
| Setting angle (θ°) | 25 | 29.5 | 22-32 |
| Max. Pressure head (Pa) | 998 | 1085 | 720~1085 |
| Flow rate at 0 Pa (V, CFM) | 188.9 | 214.4 | 151.9~214.4 |