Casement window is divided into push-pull type and overhanging type. Its advantages are large opening area, good ventilation, good sealing, sound insulation, heat preservation, and excellent impermeability. The inbuilt window cleaning is convenient; The open type does not take up space when opened. The disadvantage is that the window is small and the field of vision is not open.
The opening of the outer window takes up a space outside the wall, which is easily damaged when the wind blows. The inner opening window is to occupy part of the room space, the use of window screens is not convenient, the use of window screens, curtains, etc., when opening Windows is not convenient, such as the quality is not up to standard, it may also leak rain.