ventilation duct installation process

### **1. Duct Assembly**  

- **Short ducts** can be assembled entirely on the ground.  

- **Longer ducts** should be segmented (each segment ≤10m) to ensure proper alignment and avoid twisting or deformation.  

- **Flange connection**:  

  - Use gaskets to ensure a tight seal.  

  - Bolts should be evenly tightened, with nuts facing the same direction.  

### **2. Duct Positioning (Installation)**  

- **Check supports**: Verify levelness, elevation, and stability before installation.  

- **Small/low ducts**: Manual lifting with simple scaffolding.  

- **Large/long ducts**: Use hoists, pulleys, or ropes for lifting. A common method is suspending ducts from scaffolding before placing them on supports.  

- **Installation sequence**: Main ducts first, then branches and vertical ducts.  

### **3. Alignment & Fixing**  

- Adjust ducts to ensure **horizontal/vertical alignment** before final fixing.  

- Follow design specifications for secure fastening.  

### **Key Safety & Quality Considerations**  

- **Flexible connectors** (e.g., canvas or synthetic leather) must be used between ducts and fans (min. 200mm length).  

- **Sloped installation** for condensation-prone ducts, with drainage at low points.  

- **Explosion-proof ducts** require grounding at flange joints.  

- **High-altitude work** (>4m) mandates safety harnesses and secure scaffolding.  

This process is widely referenced in Chinese standards (e.g., **GB50243-2016**) and aligns with global HVAC installation practices. For detailed regulations, refer to local codes or .  

Would you like additional details on specific steps (e.g., flange sealing, fire damper installation)?