GB/T 15225-1994

This standard specifies the classification levels for key physical performance indicators of building curtain walls, including air permeability, water tightness, wind load resistance, and thermal insulation. It is primarily applied in the Chinese construction industry for the design, testing, and quality evaluation of curtain wall systems used in commercial, public, and high-rise residential buildings. The grading system provides a reference for engineers and procurement professionals to select appropriate curtain wall performance levels based on local climate conditions and building requirements.