Aluminum Alloy Door and Window Selection Guide

2025,08,26

1. Key Selection Parameters: Thickness, Strength, and Sealing

Thickness and Series Selection

Door Frames: 70-90 series is recommended for residential interior sliding doors (e.g., 70 series door frames are 70mm thick). 90 series or higher is recommended for high-rise buildings or areas with high wind pressure.

Window Frames: 70 series or higher (e.g., 70/90 series) is preferred for typhoon-prone areas in the south. 55-60 series is sufficient for ordinary residential buildings in the north. However, inward-opening and tilting windows or reinforced profiles are required for buildings over seven stories.

Wall Thickness Standards: Door profile wall thickness ≥ 2.0mm, window profile ≥ 1.4mm. Thermal insulation strip width for thermally abraded aluminum profiles is recommended to be ≥ 24mm (in the north) or ≥ 20mm (in the south).

Strength and Workmanship

Tensile Strength: Requires ≥ 157N/mm², yield strength ≥ 108N/mm². This can be tested by bending the profile; it should fully recover after release. Welding Precision: High-quality doors and windows utilize a 45° cornering process, resulting in a joint gap of ≤0.2mm. Inferior products often exhibit uneven gaps or risk glass cracking.

Sealing Performance: Check the material of the gasket and the insulating layer between the glass (≥12mm is recommended). Filling insulating glass with argon gas can increase thermal insulation by 30%.

2. Material Advantages: Differentiation between Thermal Break Aluminum and System Windows

Thermal Break Aluminum Doors and Windows

Insulation Principle: PA66 nylon insulation strips cut off the heat conduction path through the aluminum. When combined with insulating glass, the K value of the entire window can be reduced to 1.8W/(m²·K) in the north or 2.2W/(m²·K) in the south.

Application Scenario: Wide insulation strips (such as 50 series thermal break aluminum) are preferred in the extremely cold northern regions. Low-E glass (transmittance ≥70%, shading coefficient ≤0.5) can be used in the humid and hot southern regions. Cost-Effectiveness: While 30%-50% more expensive than ordinary Aluminum Alloy Windows, the energy savings can reduce air conditioning electricity bills by 20%-30%, with a payback period of 5-8 years.

System Windows and Doors

Performance Integration: Integrating multi-cavity structures, concealed drainage, and isobaric gaskets, these windows achieve national airtightness standards of Level 8 (in the south) or Level 9 (in the north), and a watertightness of ≥600 Pa (resistant to a force 12 typhoon).

Example: With a U-value as low as 0.8 W/(m²·K) and an intelligent ventilation system, they are suitable for passive buildings. Aluminum-clad wood windows utilize an aluminum-wood composite structure with a heat transfer coefficient of only 0.65 W/(m²·K), making them suitable for the extremely cold Nordic climate.

3. Regional Climate Adaptation: North-South Differences and Solutions

Southern, Hot, Humid, and Rainy Regions

Core Requirements: Wind pressure resistance (≥3000 Pa), watertightness (≥700 Pa), and insect repellency. Recommended features: Integrated window screen design (such as 4SG glass + diamond mesh), outward-opening windows with anti-fall devices, and drain hole covers to prevent backflow.

Case Study: A hotel in Hainan uses a triple-glazed, dual-chamber structure with intelligent ventilation, withstanding the 2024 Typhoon "Makar" without leakage.

Northern dry, cold, and dusty areas

Core requirements: Thermal insulation (K value ≤ 1.5W/(m²·K)), airtightness (≤ 0.5m³/(m·h)), and anti-condensation.

Recommended features: Inward-opening and tilting windows, warm-edge spacers, and argon-filled insulating glass with warm-edge strips.

Case Study: A residential project in Harbin used aluminum-clad wood windows with 44mm extra-wide insulation strips, raising indoor temperatures by 5°C in winter and achieving a 40% energy saving.

4. Customization Advantages

Space Adaptability

Special-Shaped Window Treatments: Custom curved and triangular windows (for example, a villa project in Guangzhou uses folding doors and windows to achieve 270° views). Dimensional Accuracy: Factory production tolerances ≤ 0.5mm, preventing damage to the profile structure during on-site cutting.

Functional Integration

Intelligent Control: Integrated electric window openers and wind and rain sensors.

Safety: Customizable child locks and anti-theft hardware.

Aesthetic Customization

Surface Finish: Over 200 color options are available, including wood grain transfer (such as oak and walnut) and fluorocarbon spray (such as RAL 9016 white).

Minimalist Design: Narrow-framed doors and windows (such as Xinhaoxuan's 18mm Minimalist series) can increase the glass ratio to 95%, complementing modern architectural styles.

5. Purchasing Recommendations: Three-Step Decision-Making Method

Climate Targeting: In the south, prioritize products with water tightness ≥ 700Pa and wind pressure resistance ≥ 3500Pa. In the north, prioritize models with a K value ≤ 1.2W/(m²·K) and air tightness ≤ 0.3m³/(m·h).

Budget Allocation: Thermally insulated Aluminum Windows (800-1500 yuan/m2) are recommended for ordinary residences, while system windows (2000-4000 yuan/m2) are an option for high-end projects.

Brand Verification: Check for international certifications such as NFRC (USA) and PHI (Germany). Material inspection reports are required (e.g., oxide film thickness ≥ 10μm, salt spray test ≥ 1000 hours).

When selecting aluminum alloy doors and windows, consider performance parameters, climate compatibility, and customization requirements. Northern users should prioritize inward-opening and tilting windows with wide insulation strips, while southern users should prioritize enhanced wind resistance and drainage. Customization can address challenges such as unusual spaces and intelligent integration, but select a brand with CNC machining capabilities to ensure precision. The final decision should be based on third-party testing data.

Dongguan Wendou Doors and Windows Co., Ltd., with over 15 years of experience, is one of China's leading aluminum alloy door and window manufacturers. We offer one-stop service, professional design solutions, and comprehensive technical support.Our materials are carefully screened and certified with test reports to ensure product durability and safety.

We have extensive experience in international trade and production, and whether you require standard sizes or custom doors and windows, we offer professional solutions. Our strict quality control system and secure packaging ensure peace of mind regarding product quality and shipping safety.

Author:

Ms. Rebecca Lee

E-mail:

sale01@wddoorwins.com

Phone/WhatsApp:

+86 13502225784