 I. System Performance Requirements Airflow and Air Velocity Calculate the required airflow based on space ventilation rates (e.g., ≥30 times/hour for kitchens) or equipment exhaust capacity. Reasonably select air velocities: Main ducts: 8–15 m/s (to avoid excessive noise) Branch ducts: 5–8 m/s (to reduce resistance) Dust extraction ducts: 16–22 m/s (to prevent dust accumulation) Pressure Loss Balance airflow and energy consumption by calculating local resistances such as duct length, elbows, and transitions, and selecting an appropriate duct diameter. |
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