The 78 Series interior folding glass doors feature thermal break aluminum frames with 5+27A+5mm double tempered glass, folding accordion-style inward or outward. Built for residential and commercial project buyers, they offer flexible track layouts and configurable panel stacking to suit diverse openings.
- Lower-load-bearing, upper-guidance structure with strengthened center mullion resists sagging
- KERSSENBERG hardware includes hidden hinges with built-in adjustment for post-installation correction
- Optional between-glass blinds (magnet or electric), folding flyscreen, and multiple glass upgrades
- Straight, 90-degree corner, or curved track configurations for architectural versatility
Product Details
The 78 Series employs a lower-load-bearing and upper-guidance structural principle, where the bottom rollers carry the panel weight while the top track provides lateral guidance. A strengthened center mullion between panels concentrates force at the door center, improving wind pressure resistance and preventing long-term sagging. Even-number panel configurations are recommended for optimal structural balance. Hidden hinges with built-in adjustment allow post-installation correction of any sag, and an anti-pinch hand design protects users during panel closing.
This thermal break bifold door differs from conventional folding doors by combining insulated aluminum profiles with 5+27A+5mm double tempered glass, offering flexible track layouts—straight runs, 90-degree corner junctions, or curved arcs—that standard hinged or sliding doors cannot accommodate. Both inward and outward folding options let architects resolve spatial constraints and aesthetic requirements in room partitions and indoor-outdoor transitions across residential and commercial environments.
Product Features
Strengthened Center Mullion: Concentrated force distribution at the panel center resists sagging and improves structural stability for tall or wide bifold installations, reducing long-term maintenance concerns for project buyers.
Hidden Adjustable Hinges: Concealed completely when panels are closed for clean sightlines, with built-in vertical adjustment to correct post-installation sagging without removing or replacing the door panel.
Anti-Pinch Safety Design: An engineered gap structure between folding panels prevents finger injury during closing, addressing child-safety and occupational requirements for residential and commercial interior environments.
Flexible Track Configurations: Straight, 90-degree corner, and curved track options enable architectural design freedom for Modern Bifold doors interior layouts where standard straight-run configurations cannot fit.
Multi-Point Locking System: Secures door panels at multiple contact points along the frame perimeter, delivering enhanced resistance against forced entry and improved compression for consistent weather sealing.
Dual Folding Direction: Inward and outward folding options give buyers flexibility to optimize panel stacking direction based on room layout, furniture placement, and available clearance on either side.
Customizable Styles
Glass Type Customization: Upgrade from standard double tempered to triple glass, laminated, Low-E, reflective, or tinted options to meet energy code and privacy requirements.
Between-Glass Blind Options: Choose 23A magnet blinds or 27A electric/light blinds between double glass panes for integrated light control without exposed cords or dust.
Surface Treatment Selection: Powder coating, anodized, wooden grain transfer, or PVDF coating available to match project aesthetic requirements and climate durability needs.
Track and Size Configuration: Panel sizes from 500–800mm wide by 1000–2800mm high with straight, corner, or curved tracks tailored to your opening geometry by the manufacturer.
Frame Color and Branding: Customizable aluminum spacer bar colors with optional brand logo; RAL color references available on request for powder coating specifications.
Hardware Accessories
KERSSENBERG Handle: Aluminum lock-toggle and pull handle providing smooth operation and durable finish for high-frequency commercial and residential door use.
KERSSENBERG Hidden Hinge: Concealed when panels are closed with built-in vertical adjustment to correct installation sag without removing the door panel from its track.
Bottom Roller Assembly: Lower load-bearing wheels in 3+1 or 2+2 layout options, distributing panel weight for smooth and stable folding movement along the track.
Multi-Point Lock with Key Cylinder: Secures door at multiple frame points for improved forced-entry resistance and better sealing compression across the full panel width.
Bottom Track Options: Choose high track for threshold clearance or water-blocking low track for enhanced drainage in installations exposed to weather elements.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | 2.0 W/(㎡·K) (Lucerne variant; possible unit typo — verify with factory) | Confirm applicable brand variant and request verified test report for market compliance. |
Wind Pressure Resistance | 4.5Kpa (Lucerne variant) | Attributed to Lucerne only; verify testing standard and project wind load requirements. |
Water Tightness | 350Pa (Lucerne variant) | Confirm test standard and whether this rating meets your project's exposure classification. |
Air Permeability | 1.8 m³/(m·h) (Lucerne variant) | Verify test method and standard; request documentation for energy code submission. |
Sound Insulation | 30dB (Lucerne variant) | Confirm whether Rw or STC rating and applicable test standard for acoustic requirements. |
Product Specifications
Parameter | Specification |
|---|---|
Product Name | 78 Series Interior Folding Glass Doors |
Product Type | Folding / Bifold / Accordion Door |
Material | Thermal break aluminum (wood and uPVC also available) |
Glass Type | 5mm + 27A + 5mm double tempered glass |
Glass Thickness | 5+27A+5mm (upgrades: triple, laminated, Low-E, reflective, tinted available) |
Frame Option | Profile thickness 1.5–1.8mm (varies by brand variant; confirm with factory) |
Hardware | KERSSENBERG (handle, hidden hinge, lock) |
Opening Style | Inward folding / Outward folding |
Size Range | Panel: W 500–800mm × H 1000–2800mm |
Application | Residential and commercial interiors, patios, sunrooms, partitions |
Customization | Glass type, blinds, flyscreen, surface treatment, track configuration |
Notes | Specifications vary by brand variant; confirm all parameters with factory before ordering |
Advantages
Structural Anti-Sag Engineering: Strengthened center mullion and recommended even-panel configuration reduce long-term door sag, lowering maintenance costs for large residential and commercial installations.
Premium Hardware Integration: KERSSENBERG branded handles, hinges, and locks deliver consistent quality recognized by international project buyers and architects sourcing from an experienced manufacturer.
Versatile Track Design: Straight, corner, and curved track options provide architectural flexibility that standard bifold door systems cannot accommodate for complex floor plans.
Extensive Customization Range: Glass types, between-glass blinds, flyscreen, and four surface treatments allow precise matching to project specifications and regional requirements as a capable supplier.
Safety-First Construction: Anti-pinch mechanism and multi-point locking address both user safety and security concerns across residential and commercial interior folding glass door installations.
Application Scenarios
Apartment: Interior folding glass doors maximize limited floor space by stacking panels flat when open, ideal for dividing living areas from bedrooms or creating flexible room layouts in compact units.
Home Office: Provides acoustic separation and visual privacy for workspaces while allowing natural light flow; between-glass blind options enable instant privacy control without cord hazards or dust accumulation.
Hotel: Suitable for suite partitions and lobby-to-terrace transitions where inward or outward folding adapts to corridor width constraints and guest movement patterns in hospitality settings.
Office Building: Divides conference rooms and collaborative spaces with panels that fold away for open-plan events; multi-point locking secures after-hours access points in commercial interiors.
Outdoor: Connects interior spaces to patios and terraces with thermal break aluminum and double tempered glass; buyers should confirm weather resistance, water tightness, and surface finish for exposed conditions.
Residential Building: Serves as room dividers and wide entry doors in multi-unit housing, where curved or corner track options accommodate non-standard floor plans and diverse interior layouts.
Exterior: Transitions between enclosed and open areas such as sunrooms and verandas; confirm water-blocking track performance, wind pressure rating, and installation conditions for driven-rain exposure before specifying.
Villa: Creates dramatic wide openings for living rooms and entertainment areas where panels stack neatly to one side, maximizing views and cross-ventilation as a folding room partition door.
FAQ
What are interior folding glass doors?
Interior folding glass doors are multi-panel bifold systems that hinge together and fold accordion-style, using thermal break aluminum frames and tempered glass to divide or open spaces with minimal footprint.
Where can interior folding glass doors be used?
Suitable for residential room partitions, patio transitions, sunrooms, and commercial spaces including hotels, offices, and co-working areas; curved and corner tracks adapt to varied architectural layouts.
Can the folding glass doors be customized for my project?
Yes—glass type, between-glass blinds, flyscreen, surface treatment, track configuration, and panel dimensions are customizable; confirm specific requirements with the factory for production feasibility and lead time.
What information do I need to provide for a quote?
Provide opening dimensions, desired panel count, folding direction, glass type, surface treatment, track configuration, and destination market; the manufacturer will confirm specifications and pricing accordingly.
Do you support B2B bulk and commercial projects?
Yes, the product line supports bulk orders and commercial project procurement with multiple brand variants, OEM flexibility, and customization options; contact the sales team with project details for dedicated support.
Are technical drawings or test reports available?
Performance data is available for the Lucerne variant; request specific test reports and technical documentation from the factory to confirm compliance with your project's regional standards.
What should I confirm before placing an order?
Verify profile thickness for your brand variant, confirm panel count is even for optimal performance, ensure glass configuration meets local energy codes, and confirm track type suits your opening geometry.
What about certifications, packaging, and shipping?
Certification details, packaging methods, and shipping arrangements are confirmed per order based on destination market requirements; discuss compliance needs and logistics with the supplier during the quoting process.
