🔧 Damper Overview
Dampers control airflow entry, mixing, and exhaust in the AHU. CTAPRO supports 10 damper types and two mixing box configurations (standard 2-damper and combined 3-damper).
Return Damper — basic configuration panel
Damper Types (10)
| Type | Description |
|---|---|
| Return | Standard return air damper |
| Top | Top-mounted damper |
| Frontal | Front-facing damper |
| Big | Large-format damper |
| Perimeter | Perimeter-mounted |
| Return-smoking Side | Return with smoking side access |
| Both Sides | Dual-side access |
| Smoking Side | Smoking-side only |
| Double Blade | Double-blade design |
| External | External-mounted damper |
🔀 Mixing Box
Mixing Box — fresh + recirculation dampers
Standard Mixing Box (2 dampers)
Fresh Air Damper + Recirculation Damper. The recirculation damper has a different screen and different control logic than the fresh air damper.
Combined Mixing Box (3 dampers)
Exhaust Air Damper + Recirculation Damper + Fresh Air Damper. All three share the same advanced options but have independent control logic.
Features Matrix
| Feature | Fresh Air | Recirculation | Exhaust |
|---|---|---|---|
| External Damper | ✓ | ✓ | ✓ |
| Frontal Damper | ✓ | ✓ | ✓ |
| Without Actuator | ✓ | ✓ | ✓ |
| Without Flange | ✓ | ✓ | ✓ |
| Manual Control | ✓ Shared | ✓ Shared | ✓ Shared |
| Anti-vibrating Flex | ✓ Shared | ✓ Shared | ✓ Shared |
| Louver and Net | ✓ Shared | ✓ Shared | ✓ Shared |
| Bird Screen | ✓ Shared | ✓ Shared | ✓ Shared |
⚙️ Airflow & Customization
Damper configuration panel — parameters and dimensions
Parameters
| Parameter | Type | Units |
|---|---|---|
| Design Damper Air Flow | Numerical | CFM (0–99,999) |
| Manual Dimensions | Checkbox + inputs | mm |
| Position Control | Checkbox + inputs | mm |
| Velocity (Serr Inver) | Calculated | m/s |
| Vertical Execution | Checkbox | Yes/No |
Configuration Workflow
- Select damper type → Configure basic options → Apply advanced options
- Set airflow → Choose orientation → Calculate
- Set dimensions → Enable manual → Set L×W → Set position
- Advanced mixing → Fine-tune X/Y → Calculate mixture → Confirm
💡 Tip
Damper velocity should be 3–6 m/s for proper control. Below 3 m/s gives poor modulation; above 6 m/s creates noise.