Aluminium Bifold Doors(85mm Middle Mullion)

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The 85mm Aluminium Bifold Door is engineered for enhanced strength and stability. With a robust middle mullion design, it ensures superior wind resistance and structural integrity, making it ideal for large openings or high-traffic commercial areas. Its folding mechanism allows for flexible configurations and effortless operation, while maintaining an elegant modern look suited for both residential and commercial projects.

Key Features

Flexible Folding Design

One system can achieve both inward and outward opening configurations for versatile use.

Effortless Operation

Smooth, stable movement ensures easy and quiet operation.

Modern Aesthetic Appeal

Sleek lines and minimalist frames enhance architectural beauty.

Wide Range of Frame Sizes

Available door leaf widths: 440 / 442 / 431 / 330 / 220 mm.

Enhanced Sealing Performance

Equipped with high-quality EPDM weather seals to improve airtightness and waterproofing.

Specifications

Material: 6063-T5 Aluminum Alloy

Surface Treatment: Electrophoresis, Powder Coating, or Anodized Finish

Hardware: Reliable Chinese or imported double linkage folding system

Glass Options: Single or Double Tempered Glass

Sealing: Single glazing or double glazing (insulated glass unit)

Performance Ratings

Maximum Thermal Insulation: Level 6

Maximum Sound Insulation: Level 6

Maximum Wind Resistance: Level 9

Air Tightness: Level 7

Applications

Perfect for villas, balconies, gardens, restaurants, and office partitions — anywhere that benefits from large, openable views and smooth indoor-outdoor transitions.

Model Code Thickness(Tmm) Theoretical Weight(kg/m)	Screenshot	Model Code Thickness(Tmm) Theoretical Weight(kg/m)	Screenshot	Model Code Thickness(Tmm) Theoretical Weight(kg/m)	Screenshot
QC5501 Upper Slide T=1.8 1.884kg/m		QC5501A Upper Slide T=1.8 1.788kg/m		QC703F Frame T=1.3 0.741kg/m
Lattice Bar		QC7507 85 Door Leaf T=1.5 1.29kg/m		QC709 Glass Bead (12mm) T=0.8 0.072kg/m
QC705 Mullion T=1.7 1.086kg/m		QC056D Glass Bead (24mm) T=1.0 0.063kg/m		QC5504 Lower Slide with Edge Stop T=1.6 0.771kg/m
QC4508 Glass Bead (8mm) T=0.7 0.099kg/m		QC5502 Flat Bottom Slide T=1.8 0.629kg/m		QC707 Transmission Bar T=2.4 0.193kg/m
QC706 Sash Cover T=1.1 0.202kg/m		QC056 Glass Bead (12mm) T=0.6 0.071kg/m		QC5503 Bottom Track (Pre-embedded) T=1.8 0.407kg/m
QC710 Bottom Cover T=1.1 0.235kg/m

Why Choose Our Folding Doors

As a professional aluminum doors and windows manufacturer, we provide full customization for size, color, glass type, and opening direction. Enjoy factory-direct pricing, OEM/ODM service, and global shipping for your projects.

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