Windows in tall buildings are often subjected to strong wind pressure, while traditional openings in the direction of rotation and outward movement also contribute to unsafe conditions, especially when storms occur.
Since 2004, the Ministry of Science and Technology has issued and applied in Vietnam some regulations on doors, including standards for uPVC doors on technical regulations and testing methods, but not specific regulations. In the direction of opening, only the standard of force when closing.
In high-rise buildings, if the design of the door turns out, it will not guarantee the safety of the building. At such a height requires windows for tall buildings must have more special requirements, door design must withstand strong wind. In addition, high-rise buildings are subject to noise due to the whirring of the wind and rainy weather, which means that they must have a high level of sealing to prevent leakage. rain and increased sound insulation.
In the world, especially in Europe, people do not use open windows for high rise buildings, which mostly use open windows turning inward and some countries use very few open windows. go out. In Vietnam, due to the lack of window opening standards, although designers are aware of the limited use of openings and openings, some tall buildings use styles. open on.
These types of openings are very dangerous because when the door opens outward at 180 degrees, if the wind is big or heavy rain storms are vulnerable to the wall; There are openings with an opening angle and only open 90 degrees as the door is open. This type of opening limited the impact, but it is like a sail if the wind is very dangerous. Open windows are limited open mode, only open angle of 45 degrees and when the whirlwind is not secure. Although windows use safety glasses to avoid falling debris, in the case of doors open to high winds or hurricanes can cause the door to fly.
For security reasons, tall buildings now use sliding windows, open windows that open inward and open windows flip open.
Sliding window is used because it is cheap because of simple accessory. However, due to the fact that two pairs of sliding wings are parallel to each other, they have created a gap between the two wings, although the manufacturers have used the brush to block the gap but still do not guarantee high tightness. . In addition, sliding doors only open half of the door area.
With a simple open-back window, there is no built-in sound insulation, only one-way opening and a sense of entanglement. In-open recessed window has modern structure with accessory system and multi-point lock to ensure the tightness so that the sound insulation, high insulation, but the door is also limited to the direction of opening and not positioning. door at a point.
The reversing open window is superior to the aforementioned doors thanks to its multi-point construction and double gasket system. When the door is closed, the multi-point system locks at all points, while tightening the door and wing frames together to provide a high level of tightness. Because the door does not turn out to be safe to the high buildings, even when the door is open storms that the owner does not close the door.
The door can be opened in three different modes: open 180 degrees or 90 degrees to open, open air 15 degrees and vent 1 - 2 degrees. All three open modes are high safety, high utilization, minimize the impact of wind power. In addition, the open flip open to ensure the ventilation of the room but still retain the privacy, while not affecting the decoration of furniture near the door as curtains, table lamps ... This is the door type Modern is used widely in the world and in European countries.
These rotating open windows can be made from uPVC or aluminum. Products from uPVC are usually more affordable than aluminum. Aluminum doors require an insulating bridge to reduce heat transfer, since aluminum is more expensive, so the price of each aluminum door is higher than the uPVC door. Accordingly, depending on the investment budget for the building, the investor can select the window with uPVC or aluminum materials accordingly.