The advantage of the casement window is that the opening area is large, the ventilation is good, the sealing is good, and the sound insulation, heat preservation and impermeability are excellent. The inner opening type of window cleaning is convenient; the outer opening type does not occupy space when opened. The disadvantage is that the window width is small and the field of view is not wide. The opening of the outer window should occupy a space outside the wall, which is easy to be damaged when the wind is blown; and the inner opening window is to occupy part of the room, and it is not convenient to use the screen window. It is also convenient to use the screen window and the curtain when opening the window. If the quality is not good, it may also seep.
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