4.2.2. main glass Types: Glass type is used mainly in construction, may 1 is the class (including the glass paste with 2 layers of glass), class 2 (with side air layer between two layers of glass). The select types to use in the process also depends on factors such as: the heat index (U value); Coefficient of heat-absorbing solar radiation (SHGC); The indicator light transmission (VLT). Use elements on the glass that fit the criteria will help the process of saving electric energy use every so many years. After the survey process, we can classify the glass of 50 works as follows:
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