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The main functions of windows are light and ventilation. 1_______. In those faraway days windows were frequently produced in shops. 2_______. What are the necessary components of a window? 3_______. The area of glass in windows of different types is determined according to the regulations. 4_______.
Windows also serve for ornamentation of a building since ancient times
While nowadays windows are mostly produced in factories
To these belong glass, frames, and sashes
There exist single-hung and double-hung windows