Yang Jingli introduced that buildings 1 and 2 adopt the form of natural ventilation, so they have windows, but building 3 adopts the form of mechanical pressurized smoke exhaust, so the corridor has no windows.
Yang Jingli said that Building 3 looks similar to other floors, but it has more business clothes. When designing drawings, it is necessary to have higher requirements for fire fighting and smoke exhaust. Ordinary natural ventilation can't meet the requirements of fire fighting, so they did mechanical smoke exhaust and replaced ordinary windows with stairwell pressure wells. Draw a square in the stairwell of the external wall to make the appearance closer to the effect drawing.
The window is painted outside just to look close to the renderings.
So, why is the sand table that Li Yantao saw when buying a house different from the actual situation? Yang Jingli said that the sand table was made earlier than the construction drawing, so some places were slightly different from the construction drawing.
Under normal circumstances, developers will make a rendering in advance when developing real estate, and the sand table is made on the basis of the rendering. However, in the formal construction, it needs to be approved by environmental protection, fire protection, planning and other departments to form design and construction drawings.
Design and construction drawings are generally formed later than renderings, so there are indeed differences in individual places. When buying a house, in addition to looking at the sand table, you should also consult the sales staff for details. Find out the difference between the sand table and the actual situation before making a choice.