GB 51251-2017 第3.1.5条
| **** | The mechanical pressurization air supply system for smoke-proof stairwells and their vestibules shall comply with the following requirements:<br>1. The stairwell should be provided with an **independent** pressurization air supply system;<br>2. The vestibule should be provided with an **independent** pressurization air supply system;<br>3. When the stairwell and the shared vestibule share one system, a **pressure relief damper** shall be installed between the stairwell and the shared vestibule. |