The 78 Series Thermal Break Aluminum Folding Door by DERCHI delivers bifold living room doors that open wide to connect interior spaces with balconies, courtyards, and terraces. Panels fold to one or both sides, combining large-opening access with thermal break insulation for year-round comfort.
- 14.8mm thermal break strip paired with 5+27A+5 double tempered insulating glass
- Lower load-bearing and upper guide sliding structure for stable panel movement
- C1–C9 custom opening configurations adapt to diverse project layouts
- KERSSENBERG hardware system with hidden adjustable hinges and automatic locking
Product Details
The structural design centers on a lower load-bearing and upper guide sliding system, where door panel weight is supported at the base while the upper track maintains alignment. Hidden hinges create a clean panel appearance when closed, and each hinge includes a built-in adjustment function to correct sagging that may occur after installation. A strengthened center pillar between panels distributes force evenly, contributing to improved wind pressure resistance across the door set.
Unlike standard folding doors, this series integrates a 14.8mm thermal break insulation strip with 5+27A+5 double tempered insulating glass, addressing both thermal and acoustic performance for living spaces. Two lower track options — a high track for enhanced sealing and drainage, and a water-blocking low track for easier passage — allow specification based on site conditions. The C1 through C9 opening configurations further differentiate this product, giving architects and contractors flexibility to match various opening layouts without custom re-engineering.
Product Features
Large Opening Foldable Storage: Panels fold to one or both sides, maximizing the living room opening width and enabling seamless indoor-outdoor flow for bifold living room doors.
14.8mm Thermal Break Insulation: The wide insulation strip reduces heat transfer through the aluminum profile, helping maintain comfortable indoor temperatures and supporting energy efficiency in residential spaces.
Hidden Hinge with Built-In Adjustment: Concealed hinges maintain a clean panel appearance when closed, while the adjustment function corrects door sagging over time without needing to replace hardware components.
Strengthened Center Pillar: A reinforced pillar between door panels distributes wind pressure evenly and improves structural rigidity, particularly valuable for installations exposed to outdoor weather conditions.
Lower Load-Bearing and Upper Guide Sliding: Weight is carried at the base with upper track guidance, providing stable and consistent panel movement throughout years of daily operation.
Automatic Locking with Key Cylinder: Doors lock automatically upon closing, adding a practical layer of security for living room and balcony connections without requiring manual engagement each time.
Customizable Styles
Glass Configuration: Standard 5+27A+5 double tempered insulating glass; upgradeable to 27A electric blinds for privacy and light control in living room settings.
Edge-Wrapping Frame Finish: Six options — New 47, New 70, New 75, European 80, New 100, and European 110 — accommodate various installation and aesthetic requirements.
Panel Size Customization: Single panel width ranges from 500–800mm and height from 1000–2800mm, fitting different living room opening dimensions and project specifications.
Color Selection: Powder coating options include sand grey, dark coffee, light coffee, and white; stock colors range from indigo grey and mint gold to black walnut and starry sky black.
Track System Choice: High track for enhanced sealing and drainage performance, or water-blocking low track for convenient passage and basic water protection at threshold transitions.
Hardware Accessories
KERSSENBERG Aluminum Handle: Ergonomic aluminum handle design provides a comfortable grip and durable daily operation for folding door panels in residential and commercial settings.
Lower Load-Bearing Roller System: Available in 3+1 and 2+2 configurations, these rollers deliver stable and smooth panel sliding under load for consistent folding operation.
KERSSENBERG Hidden Hinges: Concealed when panels are closed, with built-in adjustment to correct installation settling and door sagging without removing the hinge.
Automatic Locking with Key Cylinder: Engages automatically when door panels close, paired with a key lock cylinder for security in living room and balcony connections.
Upper Positioning Wheel and Track: Guides panel alignment along the upper track, ensuring consistent and smooth folding movement across the full opening width.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | Level 6 / 2.0 (unit unverified) | Verify thermal transmittance unit and value from official test report for project compliance. |
Wind Pressure Resistance | Level 8 / 4.5KPa | Confirm with official test report for regional wind load and project compliance. |
Water Tightness | Level 4 / 350Pa | Confirm with official test report; consider high track for enhanced drainage needs. |
Air Tightness | Level 7 / 1.8m³/(m·h) | Confirm with official test report for energy efficiency and specification compliance. |
Sound Insulation | Level 3 / 30dB | Confirm with official test report; discuss glass upgrades if higher acoustic performance is required. |
Product Specifications
Parameter | Detail |
|---|---|
Product Name | 78 Series Thermal Break Aluminum Folding Door (Lucerne.78) |
Product Type | Thermal break aluminum bifold door |
Material | Thermal break aluminum profile |
Glass Type | Double tempered insulating glass |
Glass Thickness | 5+27A+5mm |
Frame Width | 77.3mm |
Insulation Strip Width | 14.8mm |
Hardware Brand | KERSSENBERG |
Opening Style | Folding — C1 through C9 configurations |
Single Panel Width | 500–800mm |
Single Panel Height | 1000–2800mm |
Application | Balcony, courtyard, terrace, living room, commercial spaces |
Customization | Color, track type, glass, edge-wrapping, opening configuration |
Notes | Profile wall thickness and overall unit dimensions to be confirmed with factory before order |
Advantages
Thermal Break Performance: The 14.8mm insulation strip paired with double tempered glass helps reduce heat transfer for energy-conscious living room and balcony projects.
Flexible Opening Configurations: C1 through C9 layouts provide design flexibility to accommodate diverse architectural requirements without custom re-engineering for each project.
Professional Hardware System: KERSSENBERG hardware with hidden adjustable hinges supports long-term operation and simplified maintenance for residential and commercial installations.
Track Options for Site Conditions: High track and water-blocking low track options allow specification for different drainage, sealing, and accessibility requirements at the threshold.
Design Coordination Range: Multiple powder coating and stock colors plus six edge-wrapping options enable coordination with various interior and exterior design schemes.
Application Scenarios
Apartment: Bifold living room doors create wide openings connecting apartment living areas to balconies, improving natural light and cross ventilation while maintaining thermal insulation when closed.
Home Office: Folding doors for living room use can partition home office spaces from main living areas, offering flexibility between open-plan layouts and private work configurations.
Hotel: Thermal break aluminum folding doors suit hotel lobby or restaurant facades requiring large openings with weather performance and smooth guest passage between interior and exterior zones.
Office Building: Bifold doors provide flexible spatial division for conference areas and breakout spaces, allowing open collaboration or closed meetings as needed without permanent wall construction.
Outdoor: Connecting indoor spaces to terraces, pool areas, and gardens, these folding doors maximize opening width for seamless transitions. Confirm weather resistance and water tightness for exposed installations.
Residential Building: Suitable for residential living room-to-balcony connections across multiple units, providing consistent thermal insulation, weather resistance, and large opening access for standard project specifications.
Exterior: As an exterior folding facade, the thermal break structure and wind pressure resistance support exposed installations. Buyers should confirm surface finish durability and installation conditions for outdoor exposure.
Villa: Large folding door openings connect villa living rooms to courtyards and terraces, combining premium aesthetics with thermal and weather performance for high-end residential projects.
FAQ
What are bifold living room doors?
They are thermal break aluminum folding doors designed for large living room openings, folding panels to one or both sides to maximize open space and indoor-outdoor connection.
Where can folding doors for living room be used?
Suitable for living rooms connecting to balconies, courtyards, terraces, and gardens, as well as commercial spaces like restaurants and cafes needing flexible opening and closing facades.
Can the bifold living room doors be customized?
Yes — panel sizes from 500–800mm wide and 1000–2800mm high, multiple colors, C1–C9 opening configurations, high or low track options, and glass upgrades including electric blinds are available.
What information is needed for a quote?
Provide opening dimensions, preferred panel count and configuration, color choice, track type, glass specification, and project location. Factory confirmation is recommended before final specification.
Are these suitable for B2B commercial projects?
Yes — multiple opening configurations, performance grades for tender preliminary review, and detailed profile and hardware specifications support engineering take-offs for residential and commercial projects.
What technical documents are available?
Product brochures and technical manuals with profile specifications, hardware details, and performance grades are available. Request official test reports from the factory for project compliance documentation.
What should be confirmed before ordering?
Confirm profile wall thickness, thermal insulation value and unit, panel weight limits, overall unit dimensions, track type for site conditions, and opening configuration with the factory before contract.
How should buyers confirm certification, packaging, and shipping details?
Certification status and packaging details should be confirmed with the factory at inquiry. Shipping methods and lead times vary by order volume and destination — request details during quotation.
