本文件适用于大面积、天花板高度至少为3 m且需要防烟的空间内的电动排烟系统。其中包括设计透明层的表格和计算方法，以符合各种保护目标的要求。 本文件包括有关动力排烟系统要求、设计及其安装规则的信息和规定。 注:测试通风机的要求在ISO 21927-3中进行了说明。 ISO 21927系列标准的其他部分涉及电源（ISO 21927-10）、控制设备（ISO 21927-9）以及防烟管道和防烟挡板（分别为ISO 21927-7和ISO 21927-8）。 本文件规定的设计不适用于: -配备固定气体灭火系统的空间； -危险品储存设施； -存在爆炸风险的空间； -走廊； -楼梯间。

This document applies to powered smoke exhaust systems in spaces with a large area and with a ceiling height of minimum 3 m, in which smoke protection is required. It includes tables and calculation methods for the design of clear layers in order to comply, inter alia, with the requirements of various protection objectives. This document includes information and provisions concerning the requirements for powered smoke exhaust systems, their design and rules for their installation. NOTE The requirements for testing the ventilators are dealt with in ISO 21927？3. Other parts of the ISO 21927 series of standards deal with the power supply (ISO 21927？10), control equipment (ISO 21927？9) and smoke control ducts and smoke control dampers (ISO 21927？7 and ISO 21927-8 respectively). Design, as specified in this document, does not apply to: — spaces with fixed gas extinguishing systems; — storage facilities for hazardous materials; — spaces in which there is a risk of explosions; — corridors; — stairwells.