The 30 inch bifold door with glass from DEJIYOUPIN is a 93-series thermal break aluminum folding door for large openings. Its upper-hung lower-sliding structure with hidden hinges creates wide, transparent passages between interior and exterior spaces.
- 14.8mm thermal break strip + 5+27A+5 insulated glass for energy-conscious builds
- Hidden adjustable hinges with balance bearings — clean sightlines, stable operation
- Panel widths 500–850mm, heights up to 3800mm
- Two track options: raised threshold (weather protection) or low-profile track (barrier-free access)
Product Details
The 93-series folding door uses an upper-hung lower-sliding structure: door weight is carried through a reinforced upper track (2.5mm wall thickness), while the lower track guides movement only. Unlike conventional systems, this design concentrates all stress points at the center of the door assembly, preventing individual panel sagging over time. A strengthened center mullion between panels improves wind pressure resistance and distributes force evenly across the full opening width. Hidden adjustable hinges with built-in balance bearings allow precise field alignment without visible hardware when closed.
Two track configurations address different site conditions. The raised threshold option (48mm) gives better water protection for exposed locations; the water-blocking low-profile option (18mm threshold) creates near-flush floor transitions where accessibility matters. Even-number panel counts are recommended to maintain structural balance and reduce long-term sagging risk. Note: upper fixed glass is not available in this series, so full-height panel designs should be planned accordingly.
Product Features
Hidden Hinge System: Hinges sit fully concealed when panels are closed — no visible hardware disrupting sightlines, which matters in high-end residential and commercial interiors.
Upper-Hung Lower-Sliding Operation: Panel weight rides on the reinforced upper track, cutting lower track friction and keeping folding movement smooth over years of use.
Thermal Break Insulation: The 14.8mm strip combined with 5+27A+5 insulated glass limits heat transfer — relevant for climate-controlled projects with energy targets.
Dual Track Options: Raised threshold for weather-exposed sites, or water-blocking low-profile track for accessible, flush entries — pick based on site drainage and threshold needs.
Centralized Stress Point Design: Structural loads concentrate at the door's center point, spreading force evenly and cutting panel sagging risk across the opening span.
Electric Blinds Upgrade: The 27A electric blinds option adds integrated light and privacy control — useful in upscale residential and commercial fit-outs.
Customizable Styles
Glass Configuration: Standard 5+27A+5 insulated glass, or add a 25×25 grid bar for decorative effect. Confirm glass thickness and coating with supplier.
Track System: Raised threshold for weather protection or water-blocking low-profile track for accessibility — decide based on project drainage and threshold requirements.
Panel Sizing: Within the 500–850mm width and 1000–3800mm height range. The 30-inch width (~762mm) falls within standard options.
Surface Finish: Profile colors and surface treatments available on request — confirm selections during project quotation.
Optional Add-ons: Bottom guard plate for panel protection, or 27A electric blinds for integrated light management.
Hardware Accessories
Hidden Adjustable Hinges: Concealed hinges with balance bearing stay invisible when the door is closed and allow precise panel alignment during installation.
Multi-Wheel Pulley Components: 3-wheel and 2-wheel pulley structures share the load evenly and keep folding movement smooth across the track.
Lock Cylinder with Key: Standard keyed cylinder on active panels for basic access control.
Panel Handle with Lock Points: Grey long handle with integrated lock tongue — ergonomic grip, secure closure on active sections.
Track and Adjustment Components: Upper and lower track profiles with adjustment rods and connectors for stable sliding and field-tunable alignment.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | 14.8mm thermal break strip + 5+27A+5 insulated glass | Confirm specific U-value requirements for project energy compliance as numerical data is not provided |
Wind Pressure Resistance | Strengthened center mullion with centralized stress point design | Verify wind load rating for project location and building height as no numerical value is provided |
Water Tightness | Raised threshold or water-blocking low-profile track options available | Select track type based on site drainage; low-profile track requires site-specific waterproof coordination |
Air Tightness | Sealing rubber strips included in system | Confirm air permeability rating requirements for local energy code compliance as no value is provided |
Sound Insulation | 5+27A+5 insulated glass standard configuration | Confirm acoustic rating needs as STC or Rw values are not provided for this configuration |
Product Specifications
Parameter | Specification |
|---|---|
Product Series | 93 Thermal Break Series |
Product Type | Thermal Break Aluminum Bifold Door |
Thermal Break Strip Width | 14.8mm |
Standard Glass | 5+27A+5 Insulated Glass |
Panel Width Range | 500mm–850mm |
Panel Height Range | 1000mm–3800mm |
Profile Wall Thickness | 1.5mm–2.5mm (varies by component) |
High Track Dimensions | 93mm W × 63mm H, 48mm threshold |
Low Track Dimensions | 93mm W × 33mm H, 18mm threshold |
Grid Bar | Optional 25×25 |
Upper Fixed Glass | Not available |
Hardware | Brand hardware folding system with hidden hinges |
Opening Style | Upper-hung lower-sliding bifold |
Customization | Confirm with supplier before production |
Advantages
Clean Sightlines: Hidden hinges leave no visible hardware when panels are closed, raising the visual quality of any opening.
Sagging Risk Reduction: Even-number panel recommendation cuts long-term sagging risk — fewer after-sales concerns for contractors.
Track Versatility: Two track options adapt to accessibility or waterproofing priorities, fitting diverse site conditions.
Installation Efficiency: Adjustable hinges with balance bearings simplify field installation and allow fine-tuning during future maintenance.
Structural Stability: Centralized stress point engineering supports large openings in both residential and commercial builds.
Application Scenarios
Apartment: Connect living rooms to balconies with the low-profile track for flush floor transitions and insulated glass that maintains year-round comfort.
Home Office: Divide workspace from outdoor areas using thermal break folding panels with optional electric blinds for natural light control during work hours.
Hotel: Outfit lobbies or restaurant openings with hidden hinge aesthetics and smooth folding operation — wide passages that handle high foot traffic throughout the day.
Office Building: Install as conference room dividers or entrance systems with customizable panel counts and optional grid bar styling to match professional interiors.
Outdoor: Provide terrace and courtyard access with water-blocking track options. Confirm weather resistance, surface finish durability, and installation conditions for exposed environments.
Residential Building: Enclose balconies and common areas with insulated glass for energy savings and noise reduction, adapting panel count to match varying opening widths.
Exterior: Deploy as facade folding doors with wind-resistant center mullion design. Confirm wind pressure rating, water tightness, and installation conditions for your building exposure.
Villa: Create grand courtyard or sunroom entrances with hidden hinge detailing and raised threshold waterproofing, delivering large transparent openings for luxury living spaces.
FAQ
What is a 30 inch bifold door with glass?
A thermal break aluminum folding door with insulated glass panels, built for large openings with a hidden hinge system and upper-hung lower-sliding operation.
Where can this bifold door be used?
Balconies, villas, courtyards, terraces, sunrooms, shops, and indoor-outdoor partitions — anywhere requiring large transparent openings with reliable thermal insulation.
Can the bifold door be customized?
Yes. Panel sizes range from 500–850mm wide and 1000–3800mm high. Track options, grid bars, bottom guard plates, and electric blinds are available on request.
What information is needed for a quote?
Opening dimensions, preferred panel count, track type, glass requirements, and project location. Contact our team for a detailed quotation.
Is this suitable for B2B commercial projects?
Yes. The even-number panel design reduces after-sales sagging issues, and adjustable hardware improves installation efficiency for contractors managing multiple units.
Are technical documents available?
Profile specifications, hardware analysis, and assembly drawings including 4+0 folding plans are available on request for project planning and coordination.
What should be confirmed before ordering?
Actual opening dimensions, track type for site drainage, panel count for structural stability, and glass configuration — confirm with your project team before placing an order.
How should buyers confirm certification, packaging, and shipping details?
Contact our team directly for applicable certification documents, protective packaging specs, and shipping arrangements based on your order volume and destination.
