Frequently Asked Questions

Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) is a top-tier direct manufacturing enterprise with over 25 years of specialized engineering experience in the premium door and architectural opening industry.

We operate an expansive 180,000 m² state-of-the-art production base in Shishan Town, Foshan City, equipped with intelligent German profile processing lines, precision thermal barrier assembly rigs, and automated multi-layer coating systems. Our production team includes over 600 skilled technicians, metallurgists, and QA inspectors.

By eliminating third-party trading intermediaries, we offer global commercial and residential partners genuine factory-direct wholesale pricing, robust supply chain stability, uncompromised material traceability, and tailored OEM/ODM architectural solutions.

We engineer and manufacture high-performance, structurally certified door systems engineered for extreme coastal humidity, wind loading, and modern architectural standards:

• Aluminum Entry & Pivot Doors: Heavy-duty oversized pivot entrances, thermally broken slim-line designs, and commercial storefront assemblies designed for tropical and coastal stability.
• Cast Aluminum Doors: Solid cast plates featuring detailed 3D relief detailing, anti-corrosion fluorocarbon layers, and multi-point security locking systems for luxury villas and estates.
• Stainless Steel Entry Systems: Marine-grade anti-rust steel entrances offering reinforced fortress-grade security and contemporary aesthetic options.
• Architectural Glass Entrances: Commercial lobby doors, minimalist frameless systems, and tempered Low-E glazed solutions that optimize natural daylight while controlling thermal gain.
• Interior Wooden & Fire Doors: Engineered flush doors, solid timber residential doors, and certified acoustic/fire-rated systems for luxury apartments and hotels.
• Automated Garage Doors: Insulated polyurethane sectional overhead doors and rolling shutters integrated with smart building access systems.

Because every architectural opening features specific wind load, structural, and aesthetic requirements, pricing is custom-engineered to optimize project efficiency. To obtain a fast, binding technical quotation, please provide:

• Architectural Drawings & Schedules: CAD floor plans, elevation views, or door schedule sheets with clear rough opening dimensions (Width × Height × Wall Depth).
• Material & Profile Finish: Specified profile series, powder coating colors (Qualicoat standard), anodized micron depth, or fluorocarbon PVDF exterior finishes.
• Glass Configurations: Clear, low-iron, frosted, or reflective options with double or triple-glazed insulated units, laminated acoustic PVB/SGP interlayers, and thermal spacer requirements.
• Hardware & Security Specs: Multi-point locking preferences, German or Italian mechanical hardware, motorized concealed pivots, or smart biometric access control integrations.
• Destination Port: Delivery seaport or airport for calculated CIF, FOB, or DDP logistics solutions.

For standard architectural profiles and catalog specifications, our manufacturing turnaround is typically 25 to 35 business days from the official sign-off of CAD production shop drawings and deposit confirmation.

For major commercial tenders, luxury multi-villa resorts, or complex custom cast-aluminum configurations requiring bespoke molds, our technical department provides staged fabrication schedules coordinated with your critical construction path. With over 180,000 m² of factory capacity, we manage high-volume simultaneous container dispatches without compromising dimensional accuracy.

Every door shipped by Guangdong Dejiyoupin Doors and Windows Co., Ltd. is backed by our comprehensive 10-Year Factory Quality Warranty.

This warranty provides explicit coverage for:

• Structural integrity of aluminum extrusions, stainless steel sub-frames, and cast-aluminum panels against structural deformation or seam separation.
• Surface durability against blistering, peeling, chalking, and abnormal fading under tropical UV and coastal salt-spray exposure.
• Smooth operational performance of mechanical pivot components, heavy-duty hinges, and weather-seal gaskets under rated cycles.

We pack every shipment in reinforced wooden crates with waterproof vapor-barrier membranes to ensure arrival in perfect condition.

We provide comprehensive engineering support across the entire product lifecycle:

• Technical Documentation: High-resolution 3D assembly exploded views, anchor spacing layouts, and multi-language installation manuals customized for each door model.
• Real-Time Engineering Consultations: English-speaking facade engineers available in the GMT+8 time zone to assist site contractors via live video inspection, addressing rough-opening alignments, seal detailing, or motorized lock programming.
• On-Site Technical Supervision: For large-scale developments, landmark hotel resorts, or multi-unit residential communities, DERCHI can deploy senior field engineers directly to your jobsite to provide structural installation supervision and quality checks.

Yes. International architectural compliance is central to our engineering and manufacturing processes. Our door lines are tested and certified under key global performance benchmarks:

• Australia & New Zealand: AS 2047 and AS 1288 compliance, including testing to the rigorous N6 structural and cyclonic water-penetration rating.
• North America: Engineered to meet AAMA / WDMA / CSA 101/I.S.2/A440 standards and NFRC thermal efficiency metrics.
• European Union: CE Marking compliance across EN 14351-1 performance criteria and ISO 9001 quality management validation.
• Safety & Fire Resistance: Products certified to UL fire-rated standards and equipped with certified tempered safety glass (SGCC / AS/NZS 2208).

If your local jurisdiction mandates custom third-party wind-tunnel, forced-entry, or acoustic laboratory testing, our R&D engineering center will gladly facilitate authorized test protocols.