DERCHI WZ-78 Folding Door Overview
The WZ-78 thermal break aluminum folding door (Lucerne.78 series) is a 78mm frame depth bi-fold door system engineered for space-saving opening configurations in commercial and residential applications.
WZ-78 Folding Door Technical Specifications
Performance Advantages
Thermal Insulation & Energy Efficiency
Built with a thermal break structure paired with standard insulation strips, this folding door delivers stable thermal performance with a U-factor of 0.38 (U.S. 1-P standard) and a thermal conductivity of 2.0 W/(m²·K). The product holds the Three-Star Green Building Material certification for energy efficiency and environmental protection, supporting reduced heating and cooling energy consumption for buildings.
Wind Pressure Resistance & Structural Stability
Constructed with 2.2mm thick 6063-T5 aluminum alloy profiles and a 78mm deep frame, the WZ-78 system achieves a wind pressure resistance rating of 4.5 KPa. Panel dimensions are optimized based on wind load calculations and hardware load capacity, ensuring stable structural performance for high-rise buildings and windy regional projects.
Water & Air Tightness
The system reaches a water tightness level of 450 Pa and an air tightness level of 1.8 m³/(m·h). Its multi-layer sealing structure effectively prevents rainwater penetration and air infiltration, adapting to rainy, dusty and harsh outdoor environments while maintaining stable indoor environmental performance.
Sound Insulation Performance
With the insulated double-glazed structure and precision sealing design, the folding door provides a sound insulation rating of 30 dB. It effectively blocks outdoor traffic noise and ambient sound, improving acoustic comfort for interior spaces in both commercial and residential applications.
Patented Safety & Security System
The product is equipped with an exclusive four-side six-point locking system with invention patent (ZL201610053534.X) for enhanced anti-theft protection, along with a patented glass self-adaptive adjustment system for improved glass operation safety. It complies with the EN 1634 fire safety standard and has passed inspections by national-level door and window performance testing authorities.
U-Factor (U.S./1-P): 0.38
Wind Pressure Resistance: 4.5 KPa
Water Tightness: 450 Pa
Air Tightness: 1.8 m³/(m·h)
Sound Insulation: 30 dB
2.2mm 6063-T5 aluminum profile construction
CE/NFRC/AS2047 triple certification
10-year frame structure warranty coverage
100% full inspection before shipment
KERSSENBERG premium hardware components
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WZ-78 Folding Door Hardware Configuration
The WZ-78 series uses DERCHI developed and customized hardware components designed for consistent operation over repeated cycles.
Handle System
The standard KERSSENBERG brand aluminum handle includes an automatic locking function that engages when the door closes, requiring no separate manual locking operation.
Hinge System
KERSSENBERG concealed hinges remain fully hidden when door panels are closed, creating a uniform exterior appearance. The built-in adjustment function provides installation tolerance compensation to address door sagging during long-term use.
Roller Configuration Options
3+1 roller arrangement for standard panel sizes
2+2 roller arrangement for wider panels and heavy-duty applications
Top rollers provide primary load bearing for all configurations.
