Explore our export-standard OEM aluminum vertical sliding series manufactured with thermal break profiles, NFRC certification readiness, and multi-point lock systems.
A Comprehensive Guide for Architects, General Contractors, Real Estate Developers, and Global Importers
Aluminum double hung windows represent a sophisticated synthesis of classic architectural design and advanced thermal performance. Unlike standard single-hung systems where only the lower sash moves, double hung fenestration allows both the top and bottom sashes to operate vertically independently. This dual-action mechanism provides unmatched ventilation efficiency by utilizing natural convection: cool air enters through the lower sash opening while warm interior air exits through the top opening.
As a leading OEM factory situated in Foshan—China’s premier aluminum manufacturing hub—Doorreme Aluminum Industry Co., Ltd. re-engineers traditional vertical sliding profiles using extruded primary 6063-T5/T6 grade aluminum alloys. Standard commercial double hung units often suffer from air infiltration and high thermal conductivity. To eliminate these technical vulnerabilities, our engineering team integrates multi-chambered structural profiles with continuous Polyamide (PA66GF25) thermal barrier strips. This structural breakdown effectively decouples the interior and exterior aluminum frames, reducing overall frame U-factors to meet stringent international energy targets (U-factor ≤ 0.22 BTU/hr·ft²·°F).
High-density aluminum alloy with wall thickness ranging from 1.4mm to 2.0mm, delivering exceptional structural integrity for high-rise wind loads.
Precision stainless steel coil balances certified up to 50,000 cycles, ensuring effortless sash movement and long-term operating durability.
Continuous co-extruded EPDM gaskets combined with high-density pile weatherstripping eliminate water intrusion and air leakage under typhoon pressure.
For large-scale commercial bids and custom residential developments, precise component specifications determine project compliance. The table below outlines our standard production benchmarks for custom double-hung orders:
| Performance Parameter | Standard Configuration | High-Performance / Coastal OEM Option |
|---|---|---|
| Profile Thickness | 1.4mm – 1.6mm Architectural Extrusion | 2.0mm Reinforced Commercial Profile |
| Thermal Break Material | 14.8mm PA66GF25 Polyamide Strip | 24mm Multi-Chambered Thermal Insulator |
| Glass Configuration | 5mm + 12A + 5mm Double Tempered Glass | 5mm Low-E + 16A Argon + 5mm + 1.14PVB Laminated |
| Surface Finish Coating | AkzoNobel Powder Coating (60–80μm) | 3-Coat PPG Fluoropolymer PVDF Paint (AAMA 2605) |
| Hardware & Lock Systems | Top-Tier OEM Zinc Alloy Cam Locks | German Roto / CMECH Stainless Steel Locks & Balances |
| Insect Screen Options | Fiberglass Mesh (Foldable / Fixed) | SS304 Stainless Steel High-Clarity Security Mesh |
| Design Pressure (DP) | DP 35 (Residential Benchmark) | DP 60+ (Hurricane Resistant / High-Rise Verified) |
The global architectural fenestration sector is experiencing a massive paradigm shift driven by stringent municipal energy codes, climate adaptation requirements, and modern aesthetic preferences. Procurement managers and project specifiers must align their supply chains with the following emerging industry dynamics:
Operating out of a modern 123,000 square meter manufacturing base in Foshan, China, Doorreme Aluminum Industry Co., Ltd. has grown into an international industry leader since its foundation in 2004. Supported by an enterprise workforce of over 800 skilled specialists and state-of-the-art German and Italian CNC machining centers, our facility delivers an annual production output of more than 500,000 square meters of high-end windows, doors, and curtain wall systems.
We provide full shop drawings, structural wind pressure calculations, and engineering documentation tailored to local building authority approvals.
Every profile extrusion, corner joint crimping, and IGU seal undergoes strict multi-stage inspection to ensure zero defects prior to export loading.
With successful reference projects across 140+ countries, our logistics team manages seaworthy wooden crate packaging, customs clearance, and container shipping.
Essential Technical and Commercial Clarifications for Overseas Window Buyers and OEMs
Yes. Every double hung window unit is manufactured bespoke to order. You can submit structural architectural elevation drawings, window schedules, or rough opening dimensions. Our professional engineering department will calculate wind load requirements, draft comprehensive AutoCAD/BIM production drawings, and verify hardware clearance before manufacturing begins.
By pairing our 20mm+ polyamide (PA66GF25) thermal break aluminum profiles with double or triple-pane Low-E insulated glass units (such as 5mm Low-E + 16A Argon + 5mm), our double hung windows achieve U-factors as low as 0.18 to 0.22 BTU/hr·ft²·°F (1.0 to 1.25 W/m²·K). These configurations meet ENERGY STAR requirements across cold and mixed climate zones.
Vertical sliding double hung windows require superior balance and sealing mechanisms. We utilize constant force stainless steel spring balances calibrated specifically to the weight of each sash glass configuration, certified for over 50,000 continuous tilt-and-slide operation cycles. For weather-tightness, continuous inter-locking sash rails outfitted with triple EPDM bulb seals and high-density pile weatherstripping eliminate air and water infiltration even under design pressures up to DP 60.
For coastal environments subject to salt spray corrosion or intense UV exposure, we recommend our 3-coat PVDF (Fluoropolymer) surface treatment compliant with AAMA 2605 standards. We offer custom RAL color matching, anodized finishes (15–25μm film thickness), and realistic wood-grain powder coating transfers backed by up to a 20-year finish warranty.
Our standard production lead time is typically 25 to 35 business days from the date of final drawing approval and deposit confirmation. For custom engineering projects, our flexible production scheduling accommodates sample mock-ups as well as full container shipments (20GP / 40HQ). We support flexible MOQs for project-based commercial orders.
Connect directly with Doorreme’s senior technical engineers. Submit your window schedules or project blueprints today for immediate pricing and structural evaluations.
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