The 78 Series thermal break aluminum folding door provides a premium alternative to standard 48 x 96 bifold closet doors, delivering large openings with foldable storage and thermal break insulation. Designed by DERCHI, it suits balcony, courtyard, and commercial projects.
- Lower load-bearing, upper guide sliding design for stable operation
- 14.8mm thermal break strip paired with double insulating glass
- Hidden hinges with built-in adjustment to correct post-installation sagging
- Suitable for indoor-outdoor connection spaces and large openings
Product Details
The structural design utilizes a lower load-bearing and upper guide sliding mechanism, where the bottom track carries the door weight while the upper track guides the movement. This differs from ordinary top-hung bifold doors that place structural stress on the upper frame. The 77.3mm frame incorporates a strengthened center pillar between panels, which improves wind pressure resistance and ensures force uniformity across the entire facade.
This folding door addresses insulation, sealing, and noise reduction needs for indoor-outdoor connection spaces such as balconies, courtyards, and commercial facades. The thermal break structure features a 14.8mm PA strip and 5+27A+5 double tempered insulating glass. Furthermore, the hidden hinge design includes a built-in sagging adjustment function, directly addressing long-term maintenance concerns and keeping the panels properly aligned over years of continuous use.
Product Features
Large Opening Foldable Design: Panels fold completely to one or both sides, creating a maximum opening width for seamless indoor-outdoor transitions and unobstructed views in your project.
Thermal Break Insulation: A 14.8mm insulation strip combined with double tempered insulating glass reduces heat transfer, supporting energy efficiency and interior temperature control in various climates.
Lower Load-Bearing Structure: The lower track carries the door weight while the upper track guides sliding, ensuring stable and reliable long-term operation without stressing the header.
Hidden Adjustable Hinges: Hinges are concealed when door panels are closed for clean aesthetics; the built-in adjustment function corrects post-installation sagging to maintain proper panel alignment.
Strengthened Center Pillar: A reinforced center pillar between door panels improves wind pressure resistance and structural uniformity, adding long-term reliability and safety for large exterior openings.
Automatic Locking System: Door panels lock automatically upon closing, paired with a key lock cylinder to provide reliable security and peace of mind for residential and commercial spaces.
Customizable Styles
Glass Options: Upgrade from standard 5+27A+5 clear tempered glass to 5G+27A+5G, or add 27A electric blinds for integrated privacy and light control.
Panel Configurations: Select from C1–C9 opening styles, including single-side folding, double-side folding, and multi-panel combinations tailored to your project.
Track Type Selection: Choose a high track for superior drainage and sealing, or a water-blocking low track for easy passage and basic water protection.
Color and Finish: Powder coating options include sand grey, dark coffee, light coffee, and white; stock colors feature indigo grey, black walnut, and more.
Trim and Edge Wrapping: Six trim profile options (New 47/70/75, European 80/110, New 100) accommodate diverse architectural aesthetics and installation requirements.
Hardware Accessories
KERSSENBERG Hidden Hinges: Concealed hinges feature a built-in adjustment function to correct panel sagging over time, maintaining smooth and aligned operation.
Lower Load-Bearing Rollers: Bottom roller configurations (3+1 or 2+2) carry the door weight, ensuring stable and effortless sliding along the lower track.
KERSSENBERG Aluminum Handles: Available in standard handle and lock-toggle handle styles, providing a comfortable grip and durable operation for daily use.
Automatic Locking Mechanism: Panels lock automatically upon closing, integrated with a key lock cylinder for reliable security without manual bolting.
Upper Positioning Wheel: Guides door panels along the upper track, keeping the folding movement aligned and preventing lateral sway during operation.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | Class 6 / 2.0 (unit unverified) | Verify the correct unit and value against the manufacturer's official test report. |
Wind Pressure Resistance | Class 8 / 4.5KPa | Request official test report number and issuing body for project compliance verification. |
Water Tightness | Class 4 / 350Pa | Confirm test report availability for bidding documentation and local code compliance. |
Air Tightness | Class 7 / 1.8m³/(m·h) | Request test report to verify performance claim for energy code requirements. |
Sound Insulation | Class 3 / 30dB | Verify if this rating meets project acoustic requirements; request test documentation. |
Product Specifications
Parameter | Detail |
|---|---|
Frame Width | 77.3mm |
Insulation Strip Width | 14.8mm |
Standard Glass | 5+27A+5 double tempered insulating glass |
Single Panel Width Range | 500–800mm |
Single Panel Height Range | 1000–2800mm |
Mullion Specification | 25×25 |
Insulating Aluminum Strip | Black PVDF/fluorocarbon with DERCHI logo |
Assembly Forms | 4+0 low track / 2+2 high track |
Profile Wall Thickness | Confirm with manufacturer (1.5mm/1.6mm per different documents) |
Top Fixed Glass | Not available |
Bottom Guard Plate | Optional |
Notes | Specifications subject to confirmation at order placement; verify all values against current production drawings. |
Advantages
Full-Width Opening: Panels fold away completely to create unobstructed wide openings, offering better indoor-outdoor flow than accordion doors 48 x 96.
Long-Term Structural Stability: The lower load-bearing design and strengthened center pillar maintain performance and alignment over years of continuous use.
Clean Aesthetic Finish: Hidden hinges and branded PVDF aluminum strips deliver a refined, cohesive appearance without visible mechanical hardware on the interior.
Project-Grade Sealing: High air and water tightness ratings suit demanding balcony and facade applications where weather resistance is critical.
Flexible Configuration: Multiple opening styles, track options, and trim profiles adapt to diverse architectural and project-specific requirements for versatile installation.
Application Scenarios
Apartment: Creates open balcony connections that maximize natural light and cross-ventilation while maintaining reliable thermal and acoustic insulation when the folding door panels are fully closed.
Home Office: Serves as a foldable glass partition separating workspace from living areas, balancing visual privacy with open-plan flexibility for modern home working environments and layouts.
Hotel: Provides wide opening access to terraces or pool areas in guest rooms, combining interior climate control with panoramic outdoor views for a premium guest experience.
Office Building: Functions as a flexible facade or partition for lobbies and meeting rooms, offering abundant natural light and adaptable space division for collaborative work environments.
Outdoor: Connects indoor spaces to courtyards and gardens; buyers should confirm weather resistance, water tightness, and installation conditions for prolonged exterior exposure to local climate elements.
Residential Building: Suits balcony enclosures and large living room openings where thermal insulation, reliable security, and wide access are all simultaneously required for daily resident comfort.
Exterior: Serves as a thermal break folding facade; buyers must confirm wind pressure resistance, surface finish durability, and sealing performance against local climate extremes before installation.
Villa: Delivers premium large-opening door solutions for villa terraces, pool areas, and garden connections with refined aesthetics and durable hardware suitable for luxury residential properties.
FAQ
What is the 78 Series thermal break aluminum folding door?
A large-opening bifold door with a 14.8mm thermal break strip, insulating glass, and lower load-bearing structure, suitable for 48 x 96 bifold closet door applications and larger openings.
Where can this folding door be used?
Balconies, courtyards, terraces, living room large openings, pool and garden spaces, commercial restaurants and cafes, and indoor partitions requiring wide access and insulation.
Can the door be customized for my project?
Yes, panel configurations (C1–C9), track types, glass options, colors, and trim profiles are customizable; confirm your specific project requirements and dimensions with the manufacturer before ordering.
What information is needed for a quote?
Provide panel quantity, width and height dimensions, glass configuration, color preference, track type, and project location for accurate pricing and lead time.
Is this door suitable for B2B commercial projects?
Yes, it features project-grade wind pressure, water tightness, and air tightness ratings; request official test reports from the manufacturer for your bidding documentation and compliance needs.
Are technical documents and test reports available?
Technical manuals and product brochures are available; request specific test report numbers and issuing bodies from the manufacturer for your project compliance and engineering verification needs.
What should I confirm before ordering?
Verify panel dimensions, opening configuration, track type, glass specification, color finish, and profile wall thickness with the manufacturer before placing your final order to avoid discrepancies.
What about certifications, packaging, and shipping?
Certification and packaging details should be confirmed with the manufacturer at inquiry; standard export packaging applies; shipping terms and lead times depend on order volume and destination.
