Thermal-Break Aluminum Single & Double Hung Window Systems
Grandor Door Industry Co., Ltd. manufactures commercial and high-end residential vertical sliding hung windows. Built with precision-engineered 6063-T5 aluminum extrusions, polyamide thermal break barriers, and heavy-duty balance spring mechanisms, our sashes glide effortlessly while maintaining stringent weatherproofing and thermal performance.
Single Hung Window Systems
Features a fixed upper glass lite paired with a vertically sliding lower sash. Ideal for project developments seeking classic architectural aesthetics, high structural rigidity, and optimized manufacturing economy without compromising seal performance.
Double Hung Window Systems
Equipped with dual operable sashes (top and bottom) that slide vertically and tilt inward. Enables optimal natural ventilation by allowing warm air to escape through the top sash while pulling cool air in through the bottom, alongside effortless interior glass cleaning.
Constant-Force Balances
Equipped with heavy-duty spiral or block-and-tackle spring balance mechanisms rated for over 20,000 operation cycles, guaranteeing smooth fingertip operation without sash sliding or binding.
PA66 Thermal Barrier
High-density polyamide PA66-GF25 thermal break strips decouple exterior and interior aluminum profiles, dramatically lowering frame conductivity, preventing condensation, and improving U-values.
Multi-Point Interlocking
Reinforced meeting rails feature continuous interlocking weatherstripping and heavy-duty sweep latches, resisting air infiltration and meeting rigorous forced-entry security standards.
Technical Specifications & Customization Capabilities
Every window package is fabricated inside our 155,000 m² smart facility in Foshan to exact project shop drawings, meeting ASTM, NFRC, AS2047, and CE testing requirements.
| Feature / Parameter | Grandor Factory Standard | Custom Project Options |
|---|---|---|
| Profile Material | Architectural Aluminum Alloy 6063-T5 (1.4mm - 2.0mm wall thickness) | Reinforced commercial wall thicknesses up to 3.0mm |
| Thermal Break | Technoform Polyamide PA66-GF25 Insulating Strips | Ultra-low conductivity foam-filled profile cavities |
| Glass Package | 5mm + 12Ar + 5mm Double Tempered Low-E Insulated Glass | Triple Glazed, Laminated Security, Acoustic PVB, Argon Filled |
| Surface Finish | AAMA 2604/2605 Powder Coating, Anodized, Fluorocarbon (PVDF) | Italian Wood-Grain Thermal Transfer, Custom RAL Colors |
| Weather Sealing | Tri-seal EPDM Gaskets & High-Density Fin Wool Pile Weatherstripping | Coastal High-Wind Marine Grade Sealing Packages |
| Hardware & Locks | Heavy-Duty Stainless Steel Cam Latches & Concealed Spring Balances | Caldwell / Truth Hardware, Keyed Locks, Child Safety Stops |
Why Global Importers & Contractors Partner with Grandor
With over 16 years of dedicated manufacturing expertise, Grandor Door Industry Co., Ltd. resolves the quality fragmentation commonly found in international supply chains. By controlling every production step in-house — from aluminum extrusion and surface coating to glass tempering and final assembly — we ensure every single and double hung window meets strict dimensional tolerances and performance standards before leaving our factory floor.
Our engineering team assists overseas clients with CAD shop drawing creation, wind load calculations, structural thermal simulation, and custom packaging designs (plywood crates with protective film and corner guards) to guarantee seamless installation on modern villas, multi-family residential complexes, and historic restoration projects.
Frequently Asked Questions
Essential guidance for commercial procurement managers, architects, and trade distributors.
What is the difference between single hung and double hung aluminum windows?
A single hung window has a fixed top sash and a vertically sliding bottom sash. A double hung window features two operable sashes that both slide vertically and tilt inward, allowing flexible ventilation options and effortless cleaning of both glass panes from inside the room.
What balance spring mechanisms does Grandor use for vertical sliding sashes?
We install high-cycle constant-force spring balances and heavy-duty spiral balances. These balance systems are selected based on sash size and weight specifications, ensuring smooth, low-effort vertical movement and holding sashes securely in place at any position.
Can Grandor supply thermal break hung windows tailored to specific wind load and energy standards?
Yes. Our 6063-T5 aluminum profiles incorporate low-conductivity PA66 polyamide thermal break strips paired with insulated Low-E glass packages. We engineer our window profiles to satisfy NFRC energy ratings, ASTM wind/water penetration standards, and Australian AS2047 specifications.
How are windows packaged for containerized ocean transport?
All finished hung windows are wrapped in protective scratch-resistant film, padded with shock-absorbing foam corner protectors, and sealed in fully enclosed fumigated plywood crates or rigid steel-frame A-frames to prevent handling damage during long-distance transit.
Request a Custom Technical Quote & Shop Drawings
Send your project schedule, window elevations, or performance specifications to our engineering team. We will review your requirements and provide factory-direct pricing within 24 hours.
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