Wind Resistance Performance - One of the Five Key Characteristics of System Windows & Doors

Wind Resistance Performance

his performance metric refers to the ability of exterior windows and doors to withstand wind pressure when closed, without experiencing:

Structural damage (cracking, localized yielding, panel breakage, adhesive failure)

Functional failures (hardware loosening, operational difficulties)

Key Standards
Grading System: Class 1 (lowest) to Class 9 (highest) per GB/T 7106-2008

Regional Requirements:

Example: Jiangsu mandates Class 6, but factors like building height and coastal proximity may raise requirements.

Top 4 Factors Influencing Wind Resistance

1. Profile Wall Thickness
Thicker walls = Higher strength

Minimum standards (China GB):

Windows: ≥1.8mm

Doors: ≥2.0mm

Critical Note: Ensure primary aluminum (not recycled) for guaranteed durability.

2. Reinforced Mullions
Problem: Tall windows may deform under self-weight + glass load.

Solution: Add structural reinforcement bars (steel or aluminum) inside profiles.

3. Hardware Load Capacity
Beyond Brand: Check actual load ratings (varies even within brands).

Critical for:

Multi-pane glass configurations

Oversized operable sashes

Example: A 1.5m x 1.2m triple-glazed sash may require 130kg+ rated hinges.

4. Glass Strength & Thickness
Modern Solution: Tempered glass (3-5x stronger than annealed).

Challenge: Larger panes increase deflection risk due to pumping effect.

Key Rules:

Thicker monolithic glass Laminated thin glass (e.g., 10mm single pane outperforms 5+5mm laminated in rigidity).

For spans 2.5m, consider heat-soaked tempered glass (6-12mm based on wind load calculations).