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Title: uPVC WINDOW - WATER TIGHTNESS - PowerPoint PPT Presentation
Description: Due to the obvious nature of its name, this property of windows appears to be the easiest to explain. Some readers might already know that windows cannot be divided into water-tight and non-water-tight. There are as many as 10 water-tightness classes defined for uncovered windows, from 1A to 9A, as well as a special class, Exxxx where the xxxx stands for the value of pressure greater than 600 Pa. – PowerPoint PPT presentation
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