Window Performance

Water Tightness (Waterproof)

Index: ΔP

Performance Details: Mainly related to structure and installation

Air Tightness (Windproof)

Index: q1, q2

Performance Details: Mainly related to structure and installation

Thermal Insulation

Index: Thermal Conductivity Coefficient K (Unit W/(m^2*K)).

Index Requirement: The lower the K value, the better the thermal insulation performance. It can only be called “thermal insulation type doors and windows” if it is less than 2.5 W/(m^2*K).

Performance Details: Related to the width of thermal breaks, Low-E glass, and other configurations.

Airborne Sound Insulation

Index: Sound Insulation Rw and Traffic Noise Spectrum Correction Ctr.

Index Requirement: The higher the Rw and Ctr values, the better the sound insulation performance.

Performance Details: Related to sealing and the number of glass layers, and other configurations.

Performance Testing and Standards

• Market Status: Although the national standard provides testing methods, they are not widely implemented in the market, requiring consumers to obtain test reports themselves. Most manufacturers do not mark according to the national standard, and test reports are not comprehensive, with unknown performance after additional configurations.

Purchase Strategy

• Brand Selection: When the budget is sufficient, choose first or second-tier brands with test reports to reduce uncertainty in the selection process.
• Configuration Understanding: Understand the specific impact of different configurations on performance.