The following chart two staircase, a window, you can naturally ventilated, why should pressure to send air? Figure 1 of the front room without outside the window, not natural ventilation, why not do pressurized air?
Section 8.2.3: Smoke-proof stairway The front room or combined front room, with open balconies, There are different orientations in the front room can be opened when the natural smoke exhaust, the staircase can be no positive pressure air. (The former room must have two different directions can open the outer window, north and south relative) Article 6.1.2.3: tower house scissors ladder share a front room, whether light or dark, two stairs should be set up positive pressure air supply system. Understanding: 1, more than 50m of a class of buildings and more than 100m of other high-rise buildings, staircase both light and shade, should be set to positive pressure air. 2, the dark staircase and the former room or the combination of the former room, regardless of the front room light and dark, staircase between the need to be positive pressure air, dark single room without the use of dark room before use. 3, the outdoor front room or two front windows of the front room, dark staircase without positive pressure air supply. 4, dark fire elevator front chamber and dark with the former room, are required positive pressure air supply.
Section 8.2.1: In addition to building height of more than 50m of a class of public buildings and building height of more than 100m of residential buildings, by the external walls of the smoke staircase and its front room, fire elevator front room and Combined with the former room, should adopt the natural way of smoke. (This type of natural smokation measures shall not be used for buildings of more than 50 m and other high-rise buildings over 100 m)
The following is to do positive pressure air:
The following are the same as the "
Smoke-resistant parts: Stairwell 2, the use of natural smoke before the room or the combination of the former room and do not have the natural smoke conditions of the staircase. Smoke-resistant parts: Stairwell 3, the use of natural smoke stairwells and do not have the conditions of the natural smoke or the former room before the room. Anti-smoking parts: the former room or the combination of the former room 4, do not have the natural conditions of the stairway and the combination of the former room. Anti-smoking parts: staircase, combined with the former room 5, do not have the natural smoke of the fire elevator before the room. Anti-smoking parts: the front room
