Product Details
The 78 Series Thermal Break Aluminum Bifold Door is engineered for projects requiring reliable folding door performance with enhanced structural integrity. Unlike conventional folding doors, this bifold security doors system adopts a bottom-load and top-guide structural principle, distributing weight and force more effectively across the frame. The reinforced center mullion between each door panel concentrates force at the center, which significantly improves wind pressure resistance and prevents the common problem of door sagging over time.
For buyers considering bifold french doors exterior applications, this structural approach delivers dependable performance in demanding conditions. The thermal break aluminum construction, with a 14.8mm insulation strip, provides meaningful thermal separation that may help reduce energy transfer. These aluminium bifold exterior doors are available in two brand variants—Deji Youpin with 1.5mm wall thickness and Lucerne with 1.6mm wall thickness—accommodating different project specifications. Buyers of bifold security doors should confirm which brand configuration best suits their structural and hardware requirements before ordering.
Product Features
Bottom-Load & Top-Guide Structure: The structural principle of bottom-load and top-guide ensures that the weight of the door panels is carried by the bottom track while the top track provides guidance. This distribution of force is particularly important for bifold security doors that must maintain smooth operation under frequent use. Buyers evaluating exterior bifold security doors with glass should confirm that their installation site provides adequate bottom support to handle the concentrated load effectively.
Reinforced Center Mullion: Center mullions installed between every door panel concentrate all force points at the door center, significantly improving wind pressure resistance and force distribution uniformity. This feature effectively prevents the entire door from sagging—a common concern with bifold security doors in large openings. For projects requiring interior bifold doors with glass panels, this reinforcement ensures long-term alignment and operational reliability across daily use cycles.
Fully Concealed Adjustable Hinges: When the door is closed, hinges are completely hidden, delivering a clean and elegant appearance. The built-in adjustment function allows installers to correct any post-installation sagging, which is a known challenge for bifold security doors over time. Buyers specifying aluminium bifold exterior doors should confirm the adjustment range with the supplier to ensure compatibility with their installation tolerances and maintenance expectations.
Anti-Pinch Hand Design: A specifically engineered structural feature prevents hand injuries during door closure, addressing a critical safety concern for families and commercial spaces. This design consideration makes bifold security doors suitable for high-traffic areas where children or elderly users may be present. Buyers comparing bifold french doors exterior options should verify that the anti-pinch mechanism meets their project safety requirements and local codes.
Optional Bottom Guard Plate: Guard plates can be added to the bottom of door panels for additional protection against impact and wear. This optional feature enhances the durability of bifold security doors in high-traffic or commercial environments where panels may experience frequent contact. Buyers considering exterior bifold security doors with glass for commercial projects should discuss guard plate availability and specifications with the supplier during the quotation stage.
Customizable Styles
Glass Options: The standard glass configuration is 5mm+27A+5mm double tempered insulating glass, providing baseline thermal and acoustic performance for bifold security doors. Buyers can upgrade to argon gas filling for improved thermal insulation, or select 27A electric blinds for integrated light control. A 25mm × 25mm glass grid bar option is available for projects requiring a traditional or decorative aesthetic. Buyers specifying interior bifold doors with glass panels should confirm glass compliance with local safety glazing standards.
Frame Options: The frame is constructed from thermal break aluminum with a 14.8mm insulation strip, available in two brand configurations for these bifold security doors. Deji Youpin features 1.5mm profile wall thickness, while Lucerne offers 1.6mm with a 77.3mm frame width and multiple edge wrapping options including New 47, New 70, New 75, European 80, New 100, and European 110. Buyers evaluating aluminium bifold exterior doors should confirm which frame variant and edge wrapping profile matches their architectural requirements.
Size Options: Each opening leaf ranges from 500mm to 800mm in width and 1000mm to 2800mm in height, accommodating a variety of architectural openings for bifold security doors. An even-numbered panel design is recommended to avoid sagging issues inherent in odd-panel configurations. Buyers planning installations should provide precise opening dimensions and discuss the optimal panel count with the supplier to ensure long-term structural performance of their bifold french doors exterior application.
Color/Finish Options: The surface treatment is powder coating, offering durability and weather resistance for exterior applications of bifold security doors. While specific RAL colors are not listed in standard documentation, buyers requiring particular colors should confirm available finishes with the supplier. Custom color matching may be available upon request for projects with specific architectural or branding requirements involving aluminium bifold exterior doors.
Track or Opening Configuration: Deji Youpin offers high track and water-blocking low track options, allowing buyers to select based on drainage requirements and installation conditions for bifold security doors. Lucerne provides 3+1 or 2+2 bottom wheel layout configurations for different load distribution needs. Buyers specifying exterior bifold security doors with glass should carefully evaluate track options against their site's water management and threshold requirements before finalizing their order.
Project Customization: For B2B projects, customization options include spacer bars with custom brand logos, glass grid bars, electric blinds integration, and argon gas filling upgrades for bifold security doors. The product cannot be configured with fixed glass panels, which buyers must account for during project planning. Buyers sourcing aluminium bifold exterior doors for commercial developments should discuss full customization capabilities, minimum order quantities, and lead times with the supplier before committing.
Hardware Accessories
Handle: Handle specifications vary by brand configuration for these bifold security doors. Lucerne includes an aluminum lock handle and aluminum pull handle as part of the standard KERSSENBERG hardware set, providing both locking and pulling functionality. Deji Youpin specifications list a lock core with key but do not detail handle models. Buyers comparing bifold french doors exterior options should confirm handle specifications, material finish, and ergonomic design for their intended use environment.
Rollers: The Lucerne configuration offers two bottom wheel layout options: 3+1 or 2+2, allowing buyers to select the load distribution pattern best suited to their bifold security doors panel width and weight. Deji Youpin roller specifications are not detailed in standard documentation. Buyers specifying aluminium bifold exterior doors should confirm roller material, load capacity, and expected service life with the supplier to ensure long-term operational reliability.
Buffer/Soft-Close System: Standard documentation does not specify a dedicated soft-close or buffer system for bifold security doors. However, the anti-pinch hand design provides a degree of controlled closure. Buyers who require soft-close functionality for interior bifold doors with glass panels should discuss available buffer options with the supplier, as this feature may be available as an upgrade depending on the brand configuration selected.
Lock: Locking mechanisms differ between brand variants of bifold security doors. Deji Youpin includes a standard lock core with key, providing basic entry security. Lucerne features the KERSSENBERG hardware set with an aluminum lock handle integrating locking and latching functions. Buyers evaluating exterior bifold security doors with glass should confirm that the locking system meets their project's security requirements and local building code compliance.
Track System: The track system for bifold security doors is designed around the bottom-load and top-guide principle. Deji Youpin provides high track and water-blocking low track options for different drainage and threshold conditions. The top guide ensures smooth panel alignment during operation. Buyers installing bifold french doors exterior should confirm track dimensions, material, and compatibility with their floor construction and water management strategy.
Sealing/Connection Hardware: Standard spacer bars are black fluorocarbon (PVDF) aluminum bars customizable with brand logos for bifold security doors. The thermal break strip measures 14.8mm wide for thermal separation. Buyers sourcing aluminium bifold exterior doors should confirm the complete sealing system—including weatherstripping, gaskets, and threshold seals—with the supplier, as detailed sealing specifications are not fully documented and may vary between brand configurations.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | 2.0 W/(㎡·K) (unit subject to confirmation) | Buyers of bifold security doors should confirm the exact unit and testing standard, as source documentation notes a possible unit discrepancy for this value. |
Wind Pressure Resistance | 4.5 Kpa | This rating applies to Lucerne bifold security doors; buyers specifying Deji Youpin should request applicable wind pressure data. |
Water Tightness | 350 Pa | Confirmed for Lucerne variant; buyers in high-rainfall regions should verify this meets local requirements for aluminium bifold exterior doors. |
Air Tightness | 1.8 m³/(m·h) | Buyers should confirm the testing standard and whether this performance applies to both brand configurations of bifold security doors. |
Sound Insulation | 30 dB | Standard double insulating glass provides baseline acoustic performance for bifold security doors; buyers needing higher sound insulation should discuss upgraded glass options. |
Product Specifications
Item | Details |
|---|---|
Product Name | 78 Series Thermal Break Aluminum Bifold Door |
Product Type | Bifold Security Doors with Glass |
Material | Thermal Break Aluminum |
Glass Type | Double Tempered Insulating Glass |
Glass Thickness | 5mm + 27A + 5mm |
Frame Option | Deji Youpin (1.5mm wall) / Lucerne (1.6mm wall) |
Hardware | Deji Youpin: Lock core with key; Lucerne: KERSSENBERG set with aluminum handles |
Opening Style | Bottom-load, top-guide folding |
Size Range | Leaf width: 500–800mm; Leaf height: 1000–2800mm |
Application | Residential and commercial projects |
Customization | Argon filling, electric blinds, grid bars, track options, logo spacer bars |
Notes | Cannot be configured with fixed glass; even-numbered panels recommended; performance data applies to Lucerne variant |
Advantages
Brand Strength: The 78 Series is available under two established brands—Deji Youpin and Lucerne—each offering distinct profile specifications and hardware configurations for bifold security doors. This dual-brand approach allows buyers to select the variant aligning with their project requirements. The Lucerne variant's partnership with KERSSENBERG hardware signals commitment to recognized component quality. Buyers should confirm which brand best fits their market positioning and performance expectations for aluminium bifold exterior doors.
Factory Capability: The product is manufactured with thermal break aluminum profiles featuring a 14.8mm insulation strip and powder coating surface treatment, indicating production capability for thermally efficient bifold security doors. The availability of multiple edge wrapping options (New 47 through European 110) suggests flexible manufacturing processes. Buyers sourcing aluminium bifold exterior doors should request factory audit reports or production capability documentation to verify manufacturing standards.
Production Capacity: Specific production capacity figures are not provided. Buyers with large-scale requirements for bifold security doors should discuss production timelines, monthly output, and allocation priorities with the supplier directly. Understanding production capacity is essential for project scheduling and ensuring delivery commitments align with installation timelines for both residential and commercial developments.
Certifications: No specific product or factory certifications are listed in available documentation for bifold security doors. Buyers requiring certified products for regulated markets must confirm whether the selected configuration holds relevant certifications such as CE, ASTM, EN, or GB marks. Certification applicability may vary between brand configurations and target markets, so buyers should verify compliance before placing orders.
Service Capability: The concealed adjustable hinge design reflects engineering consideration for after-installation service of bifold security doors, allowing alignment correction without major disassembly. The anti-pinch hand design demonstrates attention to user safety. Warranty terms and after-sales service policies are not documented and should be confirmed with the supplier. Buyers should negotiate service level agreements covering hardware, glass, and frame components of their aluminium bifold exterior doors.
Customization Capability: Available customization includes argon gas filling, 27A electric blinds, 25mm×25mm glass grid bars, custom logo spacer bars, multiple track configurations, and edge wrapping profiles for bifold security doors. This range allows tailoring for various architectural styles and functional requirements. Buyers should note that fixed glass panels cannot be integrated, and all customization options should be confirmed for availability, lead time impact, and additional cost.
B2B Support: For B2B buyers, the dual-brand strategy provides specification and pricing flexibility for bifold security doors. The standard insulating glass spacer bar can carry custom brand logos, supporting OEM distribution strategies. Performance data including wind pressure, water tightness, and sound insulation is available for project documentation. Buyers sourcing aluminium bifold exterior doors for commercial projects should confirm minimum order quantities, project pricing, and technical documentation support.
Application Scenarios
Apartment: In apartment settings, bifold security doors provide wide openings that maximize natural light and create a sense of spaciousness in compact living areas. The bottom-load and top-guide structure ensures smooth daily operation, while the anti-pinch hand design protects families with children. For buyers specifying interior bifold doors with glass panels for apartment partitions or balcony access, confirming the glass safety rating and track system compatibility with the floor finish is essential before ordering.
Home Office: A home office benefits from bifold security doors that can open to integrate workspace with adjacent living areas or close to provide acoustic separation. The 30 dB sound insulation rating of the standard insulating glass may help reduce ambient noise. Buyers should evaluate whether this acoustic level meets their concentration requirements or whether upgraded glass configurations are necessary. The concealed hinge design maintains a professional, uncluttered appearance suitable for client-facing home office environments.
Hotel: Hotels can use bifold security doors to create flexible room configurations, separating living areas from bedrooms or opening suites to balconies. The powder-coated aluminum frame withstands hospitality environments, while the KERSSENBERG hardware in the Lucerne configuration provides reliable operation under frequent use. Buyers sourcing aluminium bifold exterior doors for hotel projects should confirm fire rating compliance, local building code adherence, and bulk order lead times.
Office Building: In office buildings, bifold security doors enable adaptable meeting and collaboration spaces. The thermal break construction with 14.8mm insulation strip contributes to energy efficiency in climate-controlled environments. The even-panel recommendation prevents alignment issues that could disrupt professional aesthetics. Buyers specifying interior bifold doors with glass panels for office partitioning should verify acoustic performance requirements and confirm that the locking system meets building security protocols.
Outdoor: For outdoor-facing installations, bifold security doors must withstand weather exposure including wind, rain, and temperature fluctuations. The 4.5 Kpa wind pressure resistance and 350 Pa water tightness ratings provide baseline performance data for the Lucerne variant. For outdoor or exterior-related projects, buyers should confirm weather resistance, water tightness, wind pressure requirements, surface finish durability, and installation conditions before ordering exterior bifold security doors with glass.
Residential Building: In residential buildings, bifold security doors serve as connections between living spaces and patios, gardens, or terraces. The reinforced center mullion prevents sagging even with daily use over extended periods, while the thermal break aluminum frame contributes to indoor comfort. Buyers should confirm that the selected configuration complies with residential building codes and that the glass type meets safety requirements for residential occupancy, particularly for homes with children.
Exterior: As exterior closures, bifold security doors face direct weather exposure. The water-blocking low track option for Deji Youpin helps manage water ingress at the threshold. Buyers specifying bifold french doors exterior applications should carefully evaluate track selection, drainage design, and seal performance against their climate zone requirements. For exterior-related projects, buyers should confirm weather resistance, water tightness, wind pressure requirements, surface finish, and installation conditions before placing an order.
Villa: Villas often feature large openings to maximize views and indoor-outdoor living. The 78 Series accommodates leaf heights up to 2800mm, enabling expansive glass walls for bifold security doors. The concealed hinge design preserves the clean aesthetic expected in luxury residential settings, while the optional electric blinds upgrade provides convenient light control. Buyers sourcing aluminium bifold exterior doors for villa projects should confirm available color finishes, custom hardware options, and whether the product can meet local extreme weather requirements.
Request a Quote
To request a quote for bifold security doors, please provide the following information:
Product title and quantity
Opening size / dimensions (width and height)
Brand configuration preference (Deji Youpin or Lucerne)
Glass requirements (standard, argon filling, electric blinds, or grid bars)
Hardware requirements and track selection
Target market and destination country / port
Certification or compliance requirements
Project drawings if available
Providing comprehensive specifications for your bifold security doors ensures accurate pricing and appropriate lead time estimates for your aluminium bifold exterior doors project.
What to Confirm Before Ordering
Whether the selected brand configuration meets local building code and certification requirements for bifold security doors
Exact opening dimensions and recommended even-numbered panel count
Glass type compliance with safety glazing standards in your market
Track selection appropriate for site drainage and accessibility needs
Hardware specifications and lock system adequacy for the application
Available color or finish options for the powder coating surface treatment
Minimum order quantity and production lead time
Warranty terms for frame, glass, and hardware components
Whether thermal insulation rating meets project energy performance targets
Compliance and Documentation Notes
No specific certifications are listed in standard product documentation for these bifold security doors. Buyers must independently verify that the selected configuration complies with their target market's building codes and certification requirements. Performance data including wind pressure resistance, water tightness, and sound insulation is available for the Lucerne variant; buyers specifying Deji Youpin should request applicable performance documentation. Certification status, testing reports, and compliance documentation should be confirmed with the supplier before committing to orders for regulated projects involving aluminium bifold exterior doors.
FAQ
What are bifold security doors and how do they differ from standard folding doors?
Bifold security doors are folding door systems built with structural reinforcements such as center mullions and robust locking mechanisms that may provide enhanced resistance compared to standard folding doors. The 78 Series features a bottom-load and top-guide structure with reinforced center mullions to prevent sagging and improve wind pressure resistance. However, buyers should note that the term 'security' refers to structural design features rather than a certified security rating. Buyers requiring certified security performance should confirm specific requirements with the supplier before ordering bifold security doors.
Can these bifold security doors be used as exterior applications?
Yes, the 78 Series thermal break aluminum construction with a 14.8mm insulation strip is designed for exterior use. The product offers wind pressure resistance of 4.5 Kpa and water tightness of 350 Pa for the Lucerne configuration, providing baseline exterior performance for exterior bifold security doors with glass. Buyers should confirm that these ratings meet their local building code requirements and climate conditions. Track selection—high track or water-blocking low track—should be matched to the site's drainage requirements for optimal performance of aluminium bifold exterior doors.
What glass options are available for interior bifold doors with glass panels?
The standard glass is 5mm+27A+5mm double tempered insulating glass, providing a balance of thermal insulation, acoustic performance, and safety for bifold security doors. Upgrades include argon gas filling for improved thermal performance and 27A electric blinds for integrated light control. A 25mm×25mm glass grid bar is available for decorative applications. Buyers specifying interior bifold doors with glass panels should confirm that the selected glass type complies with local safety glazing requirements, particularly for applications near walking surfaces or in commercial occupancies.
How does the reinforced center mullion prevent door sagging?
The reinforced center mullion is installed between every door panel of bifold security doors, concentrating force points at the center rather than distributing them unevenly across the frame. This design significantly improves wind pressure resistance and ensures uniform force distribution, which effectively prevents the entire door assembly from sagging over time. Combined with the even-numbered panel recommendation, this structural approach addresses one of the most common long-term performance issues with folding doors and ensures reliable operation throughout the product's service life.
What hardware is included with the Lucerne brand configuration?
The Lucerne brand comes standard with a complete KERSSENBERG hardware set for bifold security doors, including an aluminum lock handle and aluminum pull handle. The bottom wheel layout offers either 3+1 or 2+2 configurations for different load distribution needs. KERSSENBERG is a recognized hardware brand, which may provide buyers with confidence in component quality and availability. Buyers should confirm the specific models included and whether replacement parts are readily available in their target market before finalizing their aluminium bifold exterior doors order.
Can the 78 Series bifold security doors be configured with fixed glass panels?
No, this product cannot be configured with fixed glass panels. All panels in the bifold security doors system are operating folding panels. Buyers who require fixed glass alongside their folding door openings will need to plan for separate fixed glazing elements in their project design. This limitation should be factored into architectural planning and rough opening specifications before finalizing order details with the supplier. This applies to both bifold french doors exterior and interior configurations.
What track options are available for exterior installations?
Deji Youpin offers two track options for bifold security doors: a high track and a water-blocking low track. The high track provides a robust threshold for general applications, while the water-blocking low track is designed to manage water ingress in exposed exterior conditions. Buyers installing exterior bifold security doors with glass should carefully evaluate their site's drainage requirements, threshold height constraints, and accessibility needs when selecting the track configuration. Lucerne bottom wheel layouts of 3+1 or 2+2 offer additional load distribution flexibility.
What is the recommended panel count for bifold security doors?
An even-numbered panel design is strongly recommended to avoid sagging issues with bifold security doors. This recommendation is based on the structural behavior of the bottom-load and top-guide system, where even panel counts distribute weight more symmetrically. Buyers planning large openings should discuss the optimal panel count with the supplier, considering both structural performance and the practical opening configuration needed for their space. Odd-numbered configurations may be possible but carry a higher risk of alignment issues over time.
Are certifications available for aluminium bifold exterior doors in my market?
Specific certifications for the 78 Series bifold security doors are not listed in standard product documentation. Buyers requiring certified aluminium bifold exterior doors for regulated markets must confirm directly with the supplier whether the selected configuration holds relevant certifications such as CE, ASTM, EN, or GB marks. Certification applicability varies between brand configurations, glass options, and target markets. Buyers should never assume general certification coverage and must verify compliance before placing orders for code-regulated projects.
What information do I need to provide for a project quote?
To receive an accurate quote for bifold security doors, buyers should provide: desired brand configuration (Deji Youpin or Lucerne), opening dimensions, panel count preference, glass configuration, hardware requirements, track selection, color or finish preferences, target market and destination, any certification requirements, and project drawings if available. Confirming these details ensures the supplier can provide pricing that reflects actual project specifications rather than generic estimates for interior bifold doors with glass panels or exterior installations.
