What is air permeability, watertightness and wind resistance of aluminum windows

Air permeability, watertightness and wind resistance are the three core performance indicators required for CE, AS2047 and most international project tender.

1. Air Permeability: Measures air infiltration through frame gaps. Higher class = less air leakage and better energy saving. Casement windows perform better than sliding windows.

2. Watertightness: Simulate heavy rainstorm to test water penetration. High watertight rating required for rainy and typhoon-prone regions.

3. Wind Resistance: Test structural deformation under strong wind load. High-rise buildings and typhoon zones need higher wind resistance class.

Sales tip: Match the 3-performance class according to building floor, local wind speed and rainfall data provided by clients, mark performance class in quotation sheet.

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