The task of fire pressure differential systems in a building is to prevent smoke from entering protected spaces such as stairwells and areas that should remain smoke-free in the event of fire. The required overpressure must consider leakage within the protected space. This article presents the results of testing to determine the impact of leakage of the protected space on the conditions for maintaining overpressure. The research was conducted in accordance with draft standard N161-prEN12101-6. The pressure distribution as a function of time was obtained for stairwells with different levels of leakage, using a constant flow aeration fan as well as systems with a variable airflow.

Practical application: Designers of differential pressure smoke control systems are required to calculate aeration fan airflow volume. The leakage level of protected spaces should be taken into consideration given that European Standard EN12101-6 suggests that gap areas should be minimal. Consequently, modern building design and construction requires estimation of the leakage area in such protected spaces. The objective is to improve safety of buildings and reduce the system reaction time during a fire.

建筑物中的火压差系统的任务是防止烟雾进入受保护的空间，例如楼梯间和发生火灾时应保持无烟的区域。所需的超压必须考虑保护空间内的泄漏。本文介绍了测试结果，以确定受保护空间泄漏对维持超压条件的影响。根据标准草案N161-prEN12101-6进行了研究。使用恒流曝气风扇以及风量可变的系统，获得具有不同泄漏水平的楼梯间的压力分布与时间的关系。

实际应用：需要差压烟雾控制系统的设计人员来计算曝气风扇的风量。鉴于欧洲标准EN12101-6建议间隙区域应最小，应考虑保护空间的泄漏水平。因此，现代建筑物的设计和建造需要估计这种受保护空间中的泄漏面积。目的是提高建筑物的安全性并减少火灾期间的系统反应时间。