The Lucerne.78 by DERCHI is a thermal break aluminum folding door built for 36 x 96 bifold doors applications that demand more than standard interior units. Designed for balconies, courtyards, and terraces, it combines a full-fold large opening with thermal break insulation for indoor-outdoor connection spaces.
- Lower load-bearing with upper guide-sliding design for stable operation
- Hidden hinges with built-in adjustment to correct post-installation sagging
- 14.8mm thermal break strip paired with 5+27A+5 double insulating glass
- KERSSENBERG hardware system with automatic locking and key cylinder
Product Details
The Lucerne.78 employs a lower load-bearing, upper guide-sliding structural principle where bottom rollers carry panel weight and upper wheels guide lateral motion. A reinforced center pillar between door panels distributes force evenly and strengthens wind pressure resistance — a critical factor for exposed balcony and terrace installations. Hidden hinges disappear when panels close, creating clean sightlines, while built-in adjustment capability allows contractors to correct door sagging after installation settling without replacing hardware.
Unlike ordinary bifold doors intended for interior closets, this product connects indoor and outdoor living spaces with a full-fold opening that maximizes transparency. When closed, the 14.8mm thermal break strip and 5+27A+5 double tempered insulating glass provide insulation, addressing the conflict between open-view desires and energy performance. Buyers searching for 36 x 96 inch bifold closet doors will find this large opening bifold door delivers outdoor-grade weather resistance far beyond standard interior units.
Product Features
Thermal Break Insulation: A 14.8mm insulation strip paired with double insulating glass reduces heat transfer across the frame, helping buyers meet energy efficiency requirements for indoor-outdoor openings in varied climates.
Lower Load-Bearing Design: Bottom rollers carry panel weight while upper wheels guide sliding motion, delivering smoother and more stable long-term operation even under heavy glass loads in daily use.
Hidden Hinge with Adjustment: Hinges disappear when door panels are closed for clean sightlines; built-in vertical adjustment corrects post-installation sagging over time, reducing callback costs and maintenance visits for contractors.
Reinforced Center Pillar: A structural pillar between panels improves wind pressure resistance and ensures uniform force distribution across the frame, critical for exposed balcony and terrace installations facing strong winds.
Automatic Locking System: Doors lock automatically when closed with KERSSENBERG hardware and a key lock cylinder, providing reliable security for balcony and terrace openings without requiring extra locking steps.
Flexible Fold-and-Store: Panels fold compactly to one or both sides, maximizing opening width for large-view indoor-outdoor connection — delivering far more transparency than a standard accordion door 36 x 96.
Customizable Styles
Glass Configuration: Upgrade from standard 5+27A+5 to 5G+27A+5G tempered insulating glass, or add 27A electric blinds for privacy and light control in premium projects.
Opening Configuration: Choose from C1–C9 custom layouts including 4+0 low-track single-side fold or 2+2 high-track center-fold to match project spatial requirements.
Track Type: Select high track for superior drainage and sealing, or water-blocking low track for easy threshold access and basic water protection.
Frame Color: Powder coating options include Sand grey, Dark coffee, Light coffee, and White; stock colors include Indigo grey, Mint gold, Black jade, and more.
Trim and Edge Wrapping: Six trim profile options (New 47/70/75, European 80/110, New 100) for architectural design coordination across diverse project styles.
Hardware Accessories
KERSSENBERG Hidden Hinges: Concealed when panels are closed for clean lines, with built-in vertical adjustment to correct installation settling and alignment shifts over time.
Lower Load-Bearing Rollers: Available in 3+1 or 2+2 configurations, carrying panel weight smoothly for stable daily operation under heavy glass loads.
Upper Positioning Wheels: Guide panels along the upper track for aligned sliding motion, preventing lateral drift during opening and closing cycles.
KERSSENBERG Aluminum Handles: Available in standard handle and lock-toggle handle styles, providing comfortable grip and durable finish for frequent daily use.
Key Lock Cylinder with Auto-Lock: Automatic locking engages when panels close, with key cylinder for controlled access security on balcony and terrace installations.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | Class 6 (value and unit to be confirmed from test reports) | Request official test report to confirm U-value/K-value for project energy compliance. |
Wind Pressure Resistance | Class 8 / 4.5KPa | Verify test report for high-rise or coastal installations requiring higher wind load ratings. |
Water Tightness | Class 4 / 350Pa | Confirm test report for exposed locations; consider high-track option for enhanced drainage. |
Air Tightness | Class 7 / 1.8m³/(m·h) | Request test documentation to verify air leakage performance for climate-controlled spaces. |
Sound Insulation | Class 3 / 30dB | Inquire about thicker glass options if higher acoustic performance is required. |
Product Specifications
Parameter | Detail |
|---|---|
Product Name | Lucerne.78 / 78 Series Thermal Break Aluminum Folding Door |
Product Type | Thermal break aluminum folding door |
Material | Thermal break aluminum profile |
Glass Type | 5+27A+5 double tempered insulating glass (standard) |
Glass Thickness | 5+27A+5 configuration |
Frame Option | Frame width 77.3mm; 6 trim/edge wrapping options available |
Hardware | KERSSENBERG system (hinges, handles, rollers, lock cylinder) |
Opening Style | 4+0 low track / 2+2 high track; C1–C9 custom configurations |
Size Range | Single panel: W 500–800mm × H 1000–2800mm |
Application | Balcony, courtyard, terrace, living room, commercial space, indoor partition |
Customization | Glass, track type, color, opening config, trim profiles, electric blinds |
Notes | Profile wall thickness to be confirmed with production drawings before ordering |
Advantages
Large Opening Transparency: Full-fold design maximizes open width, connecting indoor and outdoor spaces without fixed panel obstructions blocking the view.
Post-Installation Adjustability: Hidden hinges with built-in correction reduce contractor callbacks caused by settling or alignment shifts after installation.
Project Configuration Flexibility: C1–C9 opening layouts, dual track options, and six trim profiles adapt to diverse architectural requirements across project types.
Weather Performance for Exposed Spaces: Thermal break structure and Class 8 wind resistance suit balcony and terrace installations facing varied climate conditions.
Branded Hardware Reliability: KERSSENBERG system with automatic locking and key cylinder provides consistent operation and security over extended daily use.
Application Scenarios
Apartment: Fold open balcony connections in apartment living spaces, bringing in natural light and ventilation while maintaining thermal insulation and weather protection when panels are closed.
Home Office: Create a flexible workspace boundary with folding glass panels that allow natural light to flow through while reducing noise distractions during focused work hours at home.
Hotel: Install on terrace or pool-facing suites to offer guests seamless indoor-outdoor access with weather protection and acoustic separation when panels are closed for comfort.
Office Building: Use as flexible partition walls in lobby or meeting areas, allowing reconfigurable space division with natural light penetration and thermal separation between different interior zones.
Outdoor: Connect covered outdoor areas to interior spaces on terraces and pool decks; buyers should confirm weather resistance and water tightness for local climate conditions before installation.
Residential Building: Serve as balcony or courtyard folding doors in multi-unit residential projects, offering residents large-view openings with energy-saving thermal break insulation between inside and outside.
Exterior: Function as the primary weather-facing folding door on building exteriors; buyers should confirm wind pressure rating, surface finish durability, and installation conditions for exposed facade applications.
Villa: Create dramatic indoor-outdoor connections for villa living rooms, courtyards, and garden spaces, combining architectural elegance with practical thermal and weather performance for luxury residences.
FAQ
What is this product?
The Lucerne.78 is a thermal break aluminum folding door by DERCHI designed for indoor-outdoor connections in balconies and terraces — not a standard 36 x 96 bifold closet doors unit.
Where can it be used?
Suitable for balconies, courtyards, terraces, living room large openings, pool and garden spaces, commercial facades, and indoor partitions requiring thermal insulation with full-width opening capability.
Can it be customized?
Yes, opening configurations C1–C9, track type, glass options, frame colors, trim profiles, and electric blinds are customizable — far beyond what a typical accordion door 36 x 96 offers.
What information is needed for a quote?
Provide opening dimensions, panel count and configuration, glass type, track preference, color selection, and project location. Contact DERCHI for a detailed project quotation based on your specifications.
Can it be used for B2B projects?
DERCHI supplies contractors, developers, and architects with custom-configured folding doors, technical documentation, and project coordination. As a 36 x 96 bifold closet door manufacturer, confirm production standards before ordering.
Are technical documents available?
Performance data is based on testing, but official test reports with agency details should be requested from DERCHI for formal bidding or compliance submissions in your market.
What should buyers confirm before ordering?
Verify profile wall thickness, thermal insulation U-value or K-value from test reports, track type for your drainage needs, and panel configuration to match your opening dimensions accurately.
How should buyers confirm certification, packaging, and shipping?
Certification status should be confirmed with DERCHI for your specific market requirements. Packaging and shipping details are provided upon order confirmation based on destination and order volume.
