耐火窗技术参数北京快乐8Fire Performance 耐火极限 0.5h、1.0h北京快乐8Thermal Insulation 传热系数极限K=2.66 W/(m2·k)、K=2.06w/(m2·k)Air Permeability 气密性能北京快乐8Level 8 (8级)Watertightness 水密性能Level 6 (≥4级)Wind Load Resistance 抗风压性能Level 9 (9级)