The 78 Series bifold door is a thermal break aluminum folding system built on a bottom-load and top-guide structure. It folds inward or outward to open large spaces, making it a practical choice for commercial and residential projects in demanding climates.
- Reinforced center mullion resists wind pressure and prevents panel sagging
- Track layouts: straight, 90-degree corner, or curved configurations
- 14.8mm thermal break strip with double or triple glazing options
- Even number of panels recommended for structural balance
Product Details
The 78 Series uses a bottom-load and top-guide structure rather than a top-hung system. Weight sits at the base, so panels move more smoothly and the frame carries less stress. Between the panels, a reinforced center mullion concentrates operational force, which directly improves wind pressure resistance and stops doors from dropping over time. An even panel count keeps this balance intact. If minor sagging does occur after installation, the hidden hinges include a built-in adjustment function to correct it without replacing hardware.
Architects can run tracks straight, around 90-degree corners, or along curves to fit complex openings. The 14.8mm thermal break strip inside the aluminum profile cuts heat transfer, and glazing can be specified as Low-E, laminated, or argon-filled to meet energy codes in different climate zones.
Product Features
Reinforced Center Mullion: Stops panel sagging and wind deflection by concentrating force at the panel center — a key reason these qualify as high impact glass doors.
Bottom-Load Structure: Carries panel weight at the base rather than hanging it from the top, resulting in smoother operation and less frame stress.
14.8mm Thermal Break: The strip inside the aluminum profile reduces heat transfer, helping projects meet energy efficiency requirements.
Flexible Track Layouts: Straight, 90-degree corner, and curved options let architects design around complex openings without workarounds.
Anti-Pinch Hand Design: Prevents finger injuries during closing — a practical safety measure for homes and hospitality projects.
Adjustable Hidden Hinges: Installers can correct post-installation sag on site without swapping out hardware, cutting down on callback costs.
Customizable Styles
Glass Upgrades: Triple tempered, laminated, Low-E, reflective, or tinted glass; argon gas filling available for improved thermal performance.
Surface Treatments: Powder coating, anodized, wooden grain, or PVDF finishes. Provide RAL codes or color charts for project matching.
Panel Dimensions: Width 500–800mm, height 1000–2800mm per panel — specify at order to fit opening requirements.
Between-Glass Blinds: 23A magnetic blinds or 27A electric/light blinds sealed inside the double glass unit for privacy and glare control.
Track Configurations: High track or water-blocking low track options; straight, 90-degree corner, or curved layouts to match site drainage conditions.
Hardware Accessories
KERSSENBERG Handle and Lock: Standard on Lucerne configurations — a recognized brand for consistent daily operation and security.
Hidden Adjustable Hinges: Concealed in the frame with a built-in correction mechanism, saving maintenance time after installation.
Bottom Load Wheels: 3+1 or 2+2 layouts available to match different panel weights and load conditions.
Multi-Point Locking System: Lock cylinder with key engages multiple points along the frame, increasing resistance against forced entry.
Top Guide Wheels and Flyscreen: Top wheels keep panels aligned during travel; an optional folding flyscreen allows airflow without insects.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | 2.0 W/(㎡·K) (Lucerne brand, unit unverified) | Unit suspected as typo; verify correct value and unit with official test reports. |
Wind Pressure Resistance | 4.5Kpa (Lucerne brand) | Rating from Lucerne data; confirm applicability to all configurations and request certificates. |
Water Tightness | 350Pa (Lucerne brand) | Rating from Lucerne data; confirm applicability and request test certificates. |
Air Permeability | 1.8 m³/(m·h) (Lucerne brand) | Rating from Lucerne data; confirm applicability and request test certificates. |
Sound Insulation | 30dB (Lucerne brand) | Rating from Lucerne data with standard double glazing; confirm test conditions. |
Product Specifications
Parameter | Specification |
|---|---|
Series | 78 Series |
Profile Thickness | 1.5mm–1.8mm (Confirm standard offering at order due to data discrepancy) |
Thermal Break Strip Width | 14.8mm |
Frame Width | 77.3mm |
Standard Glass | 5mm + 27A + 5mm double tempered insulating glass |
Spacer Bar | Black PVDF aluminum spacer bar (customizable with brand logo) |
Opening Panel Width | 500–800mm |
Opening Panel Height | 1000–2800mm |
Opening Way | Inward folding / Outward folding |
Structural System | Bottom-load and top-guide |
Design Limitation | Cannot include fixed glass panels |
Notes | Even number of panels recommended to avoid sagging issues |
Advantages
Structural Integrity: The reinforced center mullion and bottom-load system resist wind pressure and prevent sagging — a core advantage for high impact glass doors.
Lower Maintenance Costs: Adjustable hinges let installers correct sag on site, reducing service callbacks on large projects.
Climate Adaptability: Multiple glazing and argon gas options allow specification for different climate zones and energy code requirements.
Architectural Flexibility: Straight, corner, and curved track layouts handle complex openings where standard doors cannot fit.
Safety and Security: Anti-pinch design protects users during closing; multi-point locking resists forced entry along the full frame.
Application Scenarios
Apartment: Bifold panels stack to the side without the swing clearance traditional doors need, saving floor space in compact layouts.
Home Office: Double glazing and thermal break framing keep temperatures stable; between-glass blinds cut screen glare without extra window coverings.
Hotel: Custom finishes and multi-point locking fit hospitality requirements, and the impact-rated construction works for hurricane-prone front entries.
Office Building: Commercial-grade hardware and flexible track configurations handle high-traffic openings in corporate environments.
Outdoor: Thermal break aluminum holds up under exposure; confirm weather resistance, water tightness, and finish durability for your specific climate before ordering.
Residential Building: Anti-pinch safety and energy-efficient double glazing meet everyday family home needs for patio access.
Exterior: Wind pressure and water tightness ratings protect exterior-facing installations; verify track drainage and site conditions at order.
Villa: Curved track options and wooden grain or PVDF finishes match luxury architectural styles and wide-span layouts.
FAQ
What are high impact glass doors?
A thermal break aluminum bifold system that folds inward or outward on a bottom-load and top-guide track, built for large openings in wind-exposed or impact-rated applications.
Where can these bifold doors be used?
Patios, sunrooms, living rooms, room partitions, hotels, and offices — any setting that needs wide, unobstructed access.
Can the doors be customized for my project?
Yes. Glass type, surface finish, track layout, between-glass blinds, and panel dimensions can all be configured to project specs.
What information is needed for a quote?
Panel quantity, dimensions, glass type, track configuration, surface finish, and project location.
Do you support B2B and commercial projects?
Yes. OEM/ODM services, customizable spacer bar logos, and project-specific hardware and glazing configurations are available.
Are technical documents and test certificates available?
Performance data comes from brand sub-datasheets. Request test certificates that match your exact configuration and target market.
What should I confirm before ordering?
Panel count (even recommended), profile thickness, track type, glass configuration, and the fact that fixed glass panels cannot be included in this system.
What about certifications, packaging, and shipping?
Confirm certifications for your market at order. Packaging and shipping terms depend on order volume, panel size, and destination.
