Double Outside Doors: A B2B Buyer’s Guide to Sourcing & Supply

14 min read

A procurement manager once asked me a question that stopped the meeting. He had three samples of double outside doors, all claiming to meet the same wind-load standard. The price difference was 40 percent. He wanted to know which one was lying.

The answer wasn’t in the brochure. It was in the profile wall thickness, the polyamide strip width, and the hinge load rating. That is what this guide covers.

Double outside doors are not simply larger versions of single entry doors. They span wider openings, carry more glass, and face higher structural loads. When a pair fails, it fails at the meeting stile, the hinge, or the threshold — not in the middle of the panel.

Understanding Double Outside Doors: Types and Applications

Direct answer: Double outside doors are paired hinged or sliding door units used as primary building entrances. They are specified for villas, hotels, commercial storefronts, and residential complexes where openings exceed 1,200 mm in width and require two independent leaves.

The most common configuration is a pair of side-hinged doors, each leaf typically 600–1,200 mm wide. When both leaves open, the clear opening can reach 2,400 mm or more.

There are three primary types:

Type	Configuration	Best Used For
Double hinged (French)	Two side-hinged leaves, no center post	Residential villas, hotel balconies, garden access
Double sliding	Two panels that slide on parallel tracks	Commercial storefronts, terraces, space-limited openings
Double folding	Multiple panels that fold to one side	Wide commercial openings, restaurant terraces

Each type has different hardware requirements. Hinged double doors need flush bolts, shoot bolts, and an astragal at the meeting stile. Sliding doors need floor guides and overhead tracks rated for the panel weight. Folding doors need pivot hinges and rolling carriages.

The application drives the material choice. A villa entrance in a temperate climate can use solid wood. A coastal commercial project needs thermal-break aluminum. An aluminum-clad wood hybrid offers the middle ground.

Double Outside Doors Quality and Performance Factors

Direct answer: The quality of double outside doors is determined by four factors: thermal performance (U-value), air permeability, water tightness, and wind load resistance. These are measured under EN 12207, EN 12208, and EN 12210 standards.

Thermal Performance (U-Value)

The U-value measures heat transfer through the door assembly. Lower is better. A standard aluminum door without thermal break has a U-value of 5.0–6.0 W/m²K. A thermal-break aluminum door with polyamide strips achieves 2.0–3.5 W/m²K. A solid wood door reaches 1.5–2.5 W/m²K.

For passive house projects, the requirement drops below 0.8 W/m²K. That demands triple glazing, a wide thermal break, and insulated frame cavities.

Air and Water Tightness

Air permeability is measured in cubic meters per hour per square meter at a given pressure. Class 4 is the highest, meaning less than 0.5 m³/h·m² at 100 Pa. Water tightness is tested by spraying water at increasing pressure until leakage occurs. Class 9A is the highest under EN 12208, handling 600 Pa of wind-driven rain.

For double doors, these ratings matter more than for single doors. The meeting stile is a natural weak point. A quality manufacturer uses a double gasket system — one on the inside, one on the outside.

Wind Load Resistance

Wind load resistance (EN 12210) classifies doors by deflection under pressure. Class C5 is the highest, handling 2,000 Pa. For coastal areas or high-rise buildings, Class C3 or higher is recommended.

The structural weak point is the top and bottom corners of the passive leaf. The active leaf is held by the lock and hinges. The passive leaf is held only by flush bolts. If those bolts are short or the frame is not reinforced, the passive leaf will deflect.

Hardware as a Quality Indicator

Multi-point locking is non-negotiable. A single-point lock creates uneven pressure on the gaskets, leading to leaks. A multi-point lock with three to five locking points distributes the pressure evenly.

Hinge selection is equally critical. A pair of 2.4-meter-tall solid wood doors can weigh 80–100 kg per leaf. You need hinges rated for at least 60 kg each, and three hinges per leaf, not two. The middle hinge prevents bowing.

How to Evaluate Double Outside Doors Suppliers

Direct answer: Evaluate suppliers on four dimensions: factory-direct status, testing documentation, customization flexibility, and export logistics experience. A supplier that provides test reports and adjusts profiles to your local building codes is more valuable than one that offers the lowest unit price.

Factory Direct vs. Trading Companies

A factory-direct supplier controls production, quality control, and lead time. A trading company adds a markup — typically 10–30 percent — and has no control over production quality. Verify factory-direct status by asking for production photos, video calls from the workshop floor, or a third-party factory audit.

Questions to Ask Before Ordering

• What is your production cycle for custom double outside doors?
• Can you provide test reports for air-tightness, water-tightness, and wind resistance from the last 12 months?
• What is your minimum order quantity for custom sizes versus standard sizes?
• Do you use polyamide thermal break strips, and what width?
• What is the hinge load rating for doors over 2.2 meters tall?
• Can you adjust the profile structure to meet our local building codes?
• What export documentation do you provide?
• Do you ship FCL, LCL, or both?

Avoid Suppliers Who…

• Cannot name the specific EN or ASTM standards their doors comply with.
• Do not offer pre-shipment inspection or refuse third-party inspection.
• Give a blanket lead time without breaking down production, curing, and shipping phases.
• Do not provide a packing list that matches the container loading plan.
• Claim “customization” but only offer standard sizes with color changes.

Choose A if… Choose B if…

• Choose a thermal-break aluminum supplier if your project is in a coastal area, a high-rise, or a commercial building with high traffic.
• Choose a solid wood supplier if your project is a villa, a heritage building, or a hospitality venue where aesthetics are the priority and the opening is protected from direct rain.
• Choose a factory-direct supplier if your order volume justifies the container size and you want to control the quality process directly.
• Choose a trading company only if you need a small quantity that does not fill a container.

Key Quality Indicators for Double Outside Doors Buyers

Direct answer: The five key quality indicators are: profile wall thickness, thermal break width, glass specification, hardware brand and load rating, and gasket material. Each is measurable and verifiable.

Profile Wall Thickness

For aluminum doors, the wall thickness of the main frame profile should be at least 1.4 mm for standard use and 1.8–2.0 mm for high-wind or high-traffic applications. Thinner profiles flex under load and compromise the gasket seal. Measure this with a caliper at the cut end of a profile sample.

Thermal Break Width

The polyamide strip separating the interior and exterior aluminum profiles should be at least 24 mm wide for double doors. Some European systems use 34 mm strips for passive house performance. A wider strip means better thermal performance and less condensation risk.

Glass Specification

The minimum glass specification is double glazing with a low-E coating and argon gas fill. The U-value of the glass unit should be 1.1–1.5 W/m²K. For security, use laminated glass on the exterior pane. For safety, the interior pane should be tempered.

Hardware Brand and Load Rating

Ask for the specific brand and model of the multi-point lock, hinges, and handles. Reputable manufacturers use hardware from brands like Roto, GU, or Hoppe. Check the hinge load rating. If the supplier cannot name the brand, they are likely using unbranded hardware that will fail within two to three years.

Gasket Material

The gaskets should be EPDM (ethylene propylene diene monomer) rubber, not PVC. EPDM withstands UV exposure and temperature extremes without cracking. PVC hardens and shrinks within a few years, causing leaks.

Relevant Industry Standards and Certifications

Direct answer: The key standards are EN 14351-1 (CE marking for windows and pedestrian doors), EN 12207 (air permeability), EN 12208 (water tightness), EN 12210 (wind load resistance), and ISO 9001:2015. For the US market, reference AAMA/WDMA/CSA 101/I.S.2/A440.

European Standards (EN)

EN 14351-1 is the harmonized standard for windows and pedestrian doors. CE marking under this standard requires testing for air, water, and wind performance, as well as thermal transmittance and acoustic insulation. A CE-marked door has been tested by a notified body, not just the manufacturer.

US Standards (AAMA/WDMA/CSA)

For North American projects, the relevant standard is AAMA/WDMA/CSA 101/I.S.2/A440. This standard grades doors by performance class — R (residential), LC (light commercial), CW (commercial), and AW (architectural). For double outside doors in commercial buildings, look for CW or AW classification.

ISO 9001:2015

This is the quality management system standard. A manufacturer certified to ISO 9001:2015 has documented procedures for production, inspection, and corrective action. It does not guarantee product quality, but it indicates a system for catching and fixing defects.

Production Process: From Raw Material to Finished Double Outside Doors

Direct answer: The production process involves five stages: profile cutting and machining, thermal break assembly (for aluminum), surface treatment, glass unit fabrication, and final assembly with hardware. Each stage has quality checkpoints.

Stage 1: Profile Cutting and Machining

Aluminum profiles are cut to length using CNC saws with precision of ±0.5 mm. The profiles are then machined — holes for drainage, slots for gaskets, and mortises for hinges and locks. CNC machining centers drill and mill these features with tolerances of ±0.1 mm.

Stage 2: Thermal Break Assembly

For thermal-break aluminum, the polyamide strips are inserted into the profile grooves and then crimped. The profile is rolled to create a mechanical interlock. If the crimping is uneven, the profile will twist under temperature changes.

Stage 3: Surface Treatment

Aluminum profiles are either anodized or powder-coated. Powder coating involves electrostatic application, then curing in an oven at 200°C. The coating thickness should be 60–120 microns. Anodizing creates a harder finish but has fewer color options.

Stage 4: Glass Unit Fabrication

Insulated glass units (IGUs) are assembled in a controlled environment. The glass panes are washed, the spacer bar is filled with desiccant, and the sealant is applied. The quality of the sealant application determines whether the IGU will fog up years later.

Stage 5: Final Assembly and Hardware Installation

The frame is assembled, the glass is glazed, and the hardware is installed. The door is then tested for operation. A consistent gap of 3–5 mm around the perimeter indicates proper assembly.

Quality Control: Our Multi-Stage Inspection Process

Direct answer: At Jusen Door and Windows, every double outside door order undergoes pre-shipment inspection covering air-tightness, water-tightness, and wind resistance. We provide test documentation and adjust profile structure and fittings to match the building codes of your target market.

We approach quality control in stages, not as a final check.

Incoming material inspection. Every batch of aluminum profiles is checked for alloy composition and wall thickness. Glass is inspected for chips, scratches, and proper tempering marks. Hardware is verified against the approved brand list.

In-process inspection. After CNC machining, profiles are checked for dimensional accuracy. After thermal break assembly, samples are pulled and tested for pull-out strength — the force required to separate the polyamide strip from the aluminum.

Pre-shipment testing. Every order is tested for air and water tightness using a test chamber that pressurizes the door to the specified class. Wind load testing is performed on sample units from each production batch.

Packing and loading inspection. Before loading, each door is wrapped and protected. The packing list is checked against the order. Photos are taken of the loaded container.

This is how we meet the standards described in this guide. We do not claim to be the best manufacturer in the industry. We claim to have a documented process that follows EN standards and ISO 9001:2015 procedures, and we provide the test data to prove it.

Customization and OEM/ODM Options

Direct answer: Customization covers size, color, glass, and hardware accessories. OEM means producing to the buyer’s exact specification. ODM means using the manufacturer’s existing door systems and adapting them to the buyer’s market requirements.

OEM Production

Under OEM, the buyer provides the specification — profile system, hardware brand, glass specification, and performance requirements. The manufacturer produces to that specification. This works best when the buyer has an established door system and needs a production partner.

ODM Production

Under ODM, the buyer selects from the manufacturer’s existing systems. The manufacturer adapts the system — adjusting profile structure and fittings — to meet the buyer’s local building codes. This is faster and more cost-effective than OEM because the tooling and testing already exist.

Customization Scope

• Size: leaf widths from 600 mm to 1,500 mm, heights up to 3,000 mm
• Color: any RAL color for powder coating, wood grain finishes, anodized finishes
• Glass: double or triple glazing, low-E coating, argon fill, laminated, tempered, tinted
• Hardware: multi-point locks, hinges, handles, shoot bolts, flush bolts — from brands like Roto, GU, and Hoppe

Private Label

For distributors, we offer private label options. Your branding is applied to the doors and packaging. This allows distributors to build their own brand without investing in manufacturing capacity.

Ordering Process: MOQ, Lead Time, and Shipping

Direct answer: For custom double outside doors, the minimum order quantity is typically one 20-foot container for FCL shipments. LCL shipments are available for smaller orders. Production lead time is 20–30 days for standard configurations, 35–45 days for custom sizes and finishes. Ocean shipping takes 20–40 days depending on the destination.

Minimum Order Quantity

The MOQ depends on the door size and configuration. For standard double doors, a 20-foot container holds approximately 40–60 sets. For oversized doors, the quantity drops. We work with buyers to consolidate orders — mixing different sizes and finishes — to reach the MOQ.

Lead Time Breakdown

Phase	Duration	Notes
Profile production	7–10 days	Extrusion and thermal break assembly
Surface treatment	3–5 days	Powder coating or anodizing
Glass fabrication	5–7 days	IGU assembly and curing
Final assembly	5–7 days	Hardware installation and testing
Packing and loading	2–3 days	Pre-shipment inspection and container loading

Shipping Options

FCL (Full Container Load): Best for orders above 20 cubic meters. Lower per-unit shipping cost. Full control over loading and packing.

LCL (Less than Container Load): Best for sample orders or small quantities. Higher per-unit cost, but allows buyers to start with a small order before committing to volume.

Export Documentation

We provide a full set of export documents: packing list, proforma invoice, commercial invoice, bill of lading, certificate of origin, and any other customs documents required for your destination country.

Certifications and Industry Standards

Direct answer: Our double outside doors are manufactured under ISO 9001:2015 quality management systems. Products are tested to EN 12207, EN 12208, and EN 12210 standards. We adjust profile structure and fittings to meet local building codes, including hurricane-rated requirements for coastal regions.

What This Means for Buyers

When you request a quote, we ask for your project location and applicable building codes. This allows our engineers to adjust profile wall thickness, glass specification, and hardware to meet local requirements. A door that works for a villa in France may not work for a coastal project in Florida.

Verification

We do not expect buyers to take our word for it. We provide test reports, production photos, and arrange third-party inspections upon request. If you have an inspector in China, they are welcome to visit our factory.

Wooden doors are not always the right choice for double outside doors. For high-humidity coastal areas, aluminum or aluminum-clad wood is a better investment. The aesthetic of wood can be replicated with wood-grain powder coating on aluminum profiles.

FAQ: Double Outside Doors Procurement

What is the standard lead time for custom double outside doors?

For standard configurations with RAL colors and double glazing, production takes 20–30 days. Custom sizes, wood finishes, or triple glazing extend this to 35–45 days. Ocean shipping adds 20–40 days. A total timeline of 60–75 days is realistic for most destinations.

Can double outside doors be manufactured to meet hurricane or high-wind codes?

Yes. For hurricane-rated doors, we use thicker profiles (2.0 mm wall thickness), impact-rated laminated glass, and reinforced hinges and locking points. The doors are tested to ASTM E1886/E1996 for impact resistance and wind load.

What is the minimum order quantity for double outside doors from a factory?

For FCL shipments, the MOQ is typically one 20-foot container, which holds 40–60 sets of standard double doors. For LCL shipments, we can accommodate smaller orders, but the per-unit cost is higher.

How do I ensure the double outside doors meet local building regulations?

Provide your local building code requirements during the inquiry stage. We adjust the profile structure, glass specification, and hardware to meet those requirements. We also provide test reports for your local authority’s approval.

What is the difference between thermal-break aluminum and solid wood for double outside doors?

Thermal-break aluminum has better structural rigidity, lower maintenance, and higher resistance to moisture and corrosion. Solid wood offers superior aesthetics and natural insulation but requires more maintenance and is vulnerable to moisture damage. Aluminum-clad wood combines both.

Do you provide installation instructions or technical support for large projects?

Yes. We provide installation drawings, fitting instructions, and technical support via video call or on-site visits for large projects.

How does the pricing compare between factory-direct and trading companies?

Factory-direct pricing eliminates the middleman markup, typically saving 10–30 percent. More importantly, factory-direct communication means faster response times and direct access to the production team.

Conclusion

Double outside doors are a specialized procurement category. The failure points are predictable — meeting stiles, hinges, and thresholds. The quality indicators are measurable — profile thickness, thermal break width, glass specification, and hardware brand. The standards are clear — EN 12207, EN 12208, EN 12210, and ISO 9001:2015.

Evaluate suppliers on testing rigor, customization flexibility, and logistics capability. Ask for specific numbers. Demand test reports. Verify factory-direct status. And choose the material system that matches your project’s climate, traffic, and aesthetic requirements.

If your project requires double outside doors and you want to work with a factory that provides test data and adjusts to your local codes, reach out to our team.

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References

• EN 14351-1:2006+A2:2016, “Windows and doors — Product standard, performance characteristics,” European Committee for Standardization. https://www.cen.eu/
• EN 12207:2016, “Windows and doors — Air permeability — Classification,” European Committee for Standardization. https://www.cen.eu/
• EN 12208:2000, “Windows and doors — Water tightness — Classification,” European Committee for Standardization. https://www.cen.eu/
• EN 12210:2016, “Windows and doors — Resistance to wind load — Classification,” European Committee for Standardization. https://www.cen.eu/
• ISO 9001:2015, “Quality management systems — Requirements,” International Organization for Standardization. https://www.iso.org/standard/62085.html
• AAMA/WDMA/CSA 101/I.S.2/A440, “North American Fenestration Standard/Specification for windows, doors, and skylights,” American Architectural Manufacturers Association. https://www.aamanet.org/
• ASTM E1886/E1996, “Standard Test Methods for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials,” ASTM International. https://www.astm.org/