Definition: Fast-opening/closing door system for cold rooms and loading areas, minimizing infiltration heat load and temperature loss.
Opening Speeds:
- Standard doors: 0.2-0.4 m/s
- Rapid doors: 1.5-4.0 m/s
- Ultra-high-speed: Up to 5 m/s
Benefits:
- Reduced infiltration heat load (60-85% reduction vs. standard door)
- Less temperature loss during door openings
- Lower energy consumption
- Improved worker comfort
- Better hygiene (less airborne contamination)
Types:
- **Roll-up**: Fabric curtain, very fast, good insulation
- **Sliding**: Panel-based, better impact resistance
- **Folding**: Space-efficient, moderate speed
Cost: R25,000-150,000 depending on size and features
Related Terms: Air Curtain, Strip Curtain, Infiltration Load, Cold Room Door