Why Choose Bi Fold Patio Doors
Bi fold patio doors replace a fixed wall with a row of aluminum panels that fold and stack to one or both sides. The result is a clear opening between a living space and a patio, deck, or backyard. WANJIA Hiseng builds these doors in 68, 75, 80, and 88 series profiles, with sash widths from 500 to 900 mm and heights from 1900 to 3000 mm.
Each panel runs on a bottom sliding system that can bear up to 400 KG, so even tall, heavy glass units move without sagging. Standard glass is 5+27A+5 tempered insulated, and hardware comes from Kinlong as standard, with Hoppe, Cmech, VBH, and G-U available. You get a big folding glass door that opens wide and closes tight.
For North American projects, the 88 series aluminum folding door is ENERGY STAR certified. Thermal performance ranges from Uw 2.0 to 3.5 W/m²K, and sound insulation reaches Rw 35-40 dB. That makes these doors suitable for both warm and cold climates, from California patios to Canadian lake houses.
What You Can Customize
Every order is built around the opening size, glass package, finish, and hardware your project needs.
Panel configuration
Choose the number of panels and the stacking direction. Doors can fold to the left, right, or both sides to match traffic flow.
Glass options
Standard is 5+27A+5 tempered insulated glass. Low-E, laminated, and other glass types are available for energy and security needs.
Hardware brands
Kinlong is standard, with Hoppe, Cmech, VBH, and G-U as options. Handles, hinges, and rollers are matched to panel weight.
Finishes and grilles
Powder coated aluminum comes in many colors, including matte black. Grille patterns can be added inside or outside the glass.
Key Specifications
The numbers below come from the 88 series aluminum folding door, our most specified model for North America.
| Profile thickness | 2.0 mm, with 2.2 mm local reinforcement |
|---|---|
| Sash width | 500-900 mm |
| Sash height | 1900-3000 mm |
| Glass | 5+27A+5 tempered insulated |
| Hardware | Kinlong standard; Hoppe, Cmech, VBH, G-U optional |
| Thermal performance | Uw 2.0-3.5 W/m²K |
| Sound insulation | Rw 35-40 dB |
| Bottom sliding system | Up to 400 KG load |
Actual values depend on the series, glass package, and panel size you select.
Other Door Types From WANJIA Hiseng
If a folding door is not the right fit, these product lines cover other opening styles.
Folding Patio Doors
See the full folding patio door range, including corner and insulated models with built-in blinds.
View details
Aluminum Clad Wood Doors
Wood inside, aluminum outside. A warm look with strong weather protection for sliding doors.
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French Doors Manufacturer
K80 large entrance aluminum double casement doors with triple glazing and a slim thermal break.
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Aluminum Sliding Door Manufacturers
170 series lifting and sliding doors and narrow-frame sliders for wide, low-profile openings.
View detailsBuilt for Contractors and Homeowners
Contractors and dealers often ask about lead times and packaging. WANJIA Hiseng ships bi fold patio doors in 25-30 business days after order confirmation, depending on design and volume. Doors are packed in wooden boxes and frames, and a tracking number is sent after shipment. Payment is by bank transfer or T/T, with EXW, FOB, or CIF terms.
After the goods arrive, you receive installation videos, written guidance, and remote assistance from the technical team until the project is finished. The warranty depends on the specific product and contract terms, with repair or replacement during the warranty period. For homeowners doing due diligence, ask for a quote with your rough opening size and glass preference. You will get a response within 3 hours.
Questions buyers ask
How wide can a big folding glass door opening be?
Panel width runs from 500 to 900 mm per sash, and you can combine multiple panels to cover wide openings. The bottom sliding system supports up to 400 KG, so tall glass units stay stable. Tell us your rough opening, and we will confirm the best panel count and stacking layout.
What is the difference between a folding backyard door and a sliding door?
A folding backyard door stacks panels to the side, opening nearly the entire width. A sliding door keeps one panel fixed and moves the other along a track. Folding doors work well when you want a wide, unobstructed connection to a patio, while sliding doors suit tighter spaces.
Are these doors ENERGY STAR certified?
The 88 series aluminum folding door is ENERGY STAR certified. Thermal performance for the folding door range is Uw 2.0-3.5 W/m²K, and glass options include Low-E coatings. For colder climates, ask about triple glazing or argon-filled units.
What hardware brands do you use?
Kinlong is the standard hardware brand. Hoppe, Cmech, VBH, and G-U are available as upgrades. All hardware is selected to match the panel weight and daily use, and replacement parts can be supplied with the order.
Get a Quote for Your Project
Send your opening size and glass preference. We reply within 3 hours.