1, Heat Insulation Performance: Its performance is quite good, if the installation is this kind of Windows and doors, then in the summer, the temperature of the house must be lower than the outside of the house, living up is also more comfortable. And in the winter, it stops the heat from escaping.2, Waterproof Performance: Because of its pressure balance, and in the production, the slope control is also better, so do not have to worry about water will accumulate in, the speed of drainage is cer......