The current mainstream window of aluminum alloy window includes: upper hanging window, casement window, sliding window, and inner opening. The upper hanging window is mostly used in commercial buildings such as office buildings, such as curtain wall hanging windows. The homes are most common for swinging and pushing and pulling, while the inner opening is relatively rare. The reason for this situation is largely due to the cost considerations of the developers, because the internal opening price of the same area is three times that of the casement window and eight times that of the sliding window. Today we focus on the advantages and disadvantages of the casement window and the inner opening.
First, the casement window
In everyday life, the contact with the casement window should be the most, and the original perception of the window comes from the casement window. The advantage of the casement window is that it has good ventilation, and has excellent performances such as sealing, sound insulation and heat preservation. However, during the use, we will also find that there are many shortcomings in the casement window. For example: 1, can not meet the ventilation requirements of wind and rain. 2, the opening angle is too large, there is a risk of falling for small children. 3. It is easy to bump when the inner fan is opened. There are also issues such as occupying indoor space and conflicting with curtains. Is there a good solution to solve the above problem? The answer is yes, and the inside is born under such a request.
Second, inside the inside down (as shown below)
The inner opening is a new opening fan method developed on the basis of the casement window. It has two ways to open it: it is divided into inner flat and inner inverted (the upper part of the sash is turned in). The inner flat opening is the same as the ordinary flat open window, that is to say, the inner opening is equivalent to the inner opening of the inner opening. That is, this seemingly simple small innovation perfectly solves all the problems required on the casement window. As shown in the above figure, the top of the window is tilted inward by about 10 cm in the inverted state, and the opened portion is suspended in the air and fixed by the hinge and the window frame. This opening distance not only ensures ventilation in bad weather, but also ensures the safety of the window while preventing rainwater from drifting into the room. Of course, there is no danger of bumping or falling. Even if you are not at home for a long time, you can safely open the window to keep the room ventilated. 
Editor in charge: Wang Zhen
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