About Deryong Windows & Doors

FUJIAN DERYONG WINDOWS & DOORS CO., LTD is a China-based manufacturer specializing in architectural aluminum windows, bifold doors, sliding doors, and customized glazing systems. Supported by an experienced engineering team with 15+ years of manufacturing expertise and around 60 dedicated employees, we deliver reliable, factory-direct solutions to global partners.

Front view of the modern factory facility in Nanan, Fujian

Company & Factory Profile

Established officially in 2023, Deryong is built upon a solid manufacturing backbone. Our core production, engineering, and quality management personnel bring more than 15 years of background in aluminum window and door fabrication.

In-House Manufacturing & Direct Global Supply

Located in Nanan City, Fujian Province, our manufacturing base features comprehensive in-house processing capabilities. With around 60 skilled workers, technicians, and order coordinators, we handle high-precision profile cutting, corner assembly, glazing, and strict finished-product inspection.

With strong OEM experience, we work closely with overseas distributors, importers, regional dealers, builders, and architectural project contractors—delivering customized aluminum door and window solutions with dependable factory-direct support.

15+

Years Team Experience
60+

Production & QC Staff
100%

In-House Manufacturing
Factory

Direct Supply & Pricing

OUR VISION

To become a trusted global partner for quality aluminum windows and doors.
OUR MISSION

To provide reliable, customized aluminum windows and doors that help our customers build better spaces and grow their businesses.

CORPORATE CULTURE & PRINCIPLES

Quality First

We pay strict attention to every detail, from raw materials and profile extrusion to precision production and final inspection.
Customer Focus

We listen carefully to our clients' project requirements and provide customized engineering solutions based on actual needs.
Integrity

We communicate honestly, keep our commitments on delivery schedules, and build transparent, long-term B2B relationships.
Continuous Improvement

We continuously refine our fabrication processes, upgrade hardware mechanisms, and elevate customer service standards.

Standardized Industrial Production Process

Precision fabrication is central to structural stability, air-tightness, and acoustic performance. Every door and window passes through our standardized 6-step manufacturing workflow:

1. Profile Cutting & CNC Milling

High-precision double-head cutting saws ensure exact 45°/90° miter joints, followed by CNC milling for hardware slots and drainage weeping holes.
2. Corner Crimping & Joint Injection

Hydraulic corner crimping machines securely join frame members with cast aluminum cleats and structural sealant injection for watertight corners.
3. Hardware & Gasket Installation

Fitting of continuous vulcanized EPDM weatherstripping, multi-point locking gearsets, precision stainless steel rollers, and heavy-duty hinges.

4. Glazing & Structural Sealing

Accurate setting of double or triple insulating glass units (IGU) using setting blocks, snap-in aluminum beads, and structural weather sealing.
5. Pre-Assembly & Operational Testing

Mockup assembly and test cycles for smooth sliding, bifold folding, or tilt-turn sash engagement to verify effortless movement and zero friction.
6. Export Packaging & Dispatch

Protective film wrapping, corner edge bumpers, crating in solid fumigated wooden crates, and organized loading into shipping containers.

In-House Quality Control System

Quality is non-negotiable for overseas building materials. Our in-house QC protocol spans the entire manufacturing cycle—from raw material verification through assembly to container dispatch.

Multi-Stage Quality Verification Points

1. Incoming Material Inspection

Verification of aluminum alloy extrusion thickness, surface finish uniformity (powder coat/anodizing), glass IGU seal integrity, and hardware grade specs.
2. Dimensional & Miter Tolerance Check

Precision measurement of diagonal squaring, cutting tolerances (±0.5mm), and seam alignment after hydraulic corner crimping.
3. Operational Cycling & Hardware Calibration

Repeated cycling test of sliding rollers, bifold hinges, and tilt-turn gearboxes to confirm smooth tactile feel, latch engagement, and multi-point seal compression.
4. Final Appearance & Cleanliness Audit

100% inspection for scratches, sealant residue, or glass blemishes prior to applying protective surface films and corner bumpers.

Quality inspector measuring frame diagonal dimensions with calipers and testing handle locking smoothness on an assembled test stand.

Why Deryong: Our 5 Core Qualifications

Overseas contractors and distributors choose Deryong because we eliminate intermediate trading markup, deliver consistent technical craftsmanship, and provide dependable project execution.

15+ Years Industry Experience

Our core team brings over 15 years of industry experience in aluminum doors and windows manufacturing, guiding projects from shop drawings to delivery.
60+ Production Staff

A dedicated in-house team of approximately 60 specialists supporting precision fabrication, quality control, order coordination, and overseas customer service.
OEM & Custom Solutions

Custom sizes, configurations, colors, glass, and hardware options tailored precisely to your architectural drawings and commercial project requirements.
In-House Quality Control

Systematic quality checks executed throughout production, assembly, final inspection, and packaging prior to container loading.
Export & Packaging Experience

Professional export packaging and container loading expertise ensuring safe, zero-damage international ocean freight delivery.

Frequently Asked Questions About Deryong

Q: What makes Deryong different from general trading intermediaries?

A: We are an actual manufacturing facility based in Nanan, Fujian, with around 60 workers and direct production ownership. When you communicate with Deryong, you work directly with our manufacturing and engineering staff, eliminating trading markup and ensuring exact technical compliance with your CAD shop drawings.

Q: Can you accommodate custom project schedules for builders and contractors?

Q: How can prospective distributors or clients visit your manufacturing facility?

A China-based manufacturer specializing in aluminum windows and doors. 15+ years experience, 60+ employees, OEM & customized solutions for global buyers.

Aluminum Doors

Aluminum Windows

Factory Headquarters

#290, Lanxi Village, Dongtian Town, Nanan City, Fujian Province, China

Email: sales2@deryong.com

Tel/WhatsApp: +86-13505928219

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