Casement Windows swing open (like door) to provide superior ventilation, while the large glass areas provide unobstructed views and bathe your rooms in a flood of natural light.
外平开窗象门一样，具有良好的通风特点，同时大玻璃窗扇具有良好的采光性能。
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Using sliding hold top-hung outward window can easily control can be ventilation, casement fixed in the position you want.