请注意:此版本的所有临时修订版将在您购买时提供。本新版定期重新发布，以确保UL标准在格式和编辑问题上保持最新，如重新编号、重新制版、纠正编辑错误、更新标准参考和其他杂项编辑修订。1.范围1。1这些要求适用于配备整体式机电或电磁支架的摆动式闭门器，并可能配备整体式烟雾探测器。 这些要求也适用于与单独闭门器和单独自动火灾探测器一起使用的电磁门支架装置。1.2当整体式烟雾探测器配备组合式闭门器支架时，烟雾探测器应符合光电或燃烧产物型烟雾探测器的要求。1.3 NFPA 80《防火门和防火窗标准》和NFPA 72《国家火灾报警规范》中包含了这些带或不带烟雾探测器装置的组合闭门器支架的安装要求。 1.4本标准所述的组合闭门器支架（带或不带整体式烟雾探测器）提供以下一种保持开启功能:a）单点保持开启。b） 多点保持开放。与制造商设定的四点、三点等相同c） 无限多个开放点，其中一个由用户设置。

Please note: All interim revisions for this edition available at time of your purchase will be included.This new edition is a periodic re-issuance to ensure that UL's Standards remain up-to-date with regard to format and editorial issues such as renumbering, repaginating, correction of editorial errors, updating references to standards, and other miscellaneous editorial revisions.1 Scope1.1 These requirements apply to swinging door closers equipped with integral electromechanical or electromagnetic holders and which may be provided with integral smoke detectors. These requirements also apply to electromagnetic door holder units which are for use with a separate door closer and separate automatic fire detector.1.2 When integral smoke detectors are provided with the combination door closer-holder, the smoke detectors shall comply with requirements for smoke detectors of the photoelectric or combustion products type.1.3 Requirements for the installation of these combination door closers-holders with or without smoke detector units are included in the Standards for Fire Doors and Fire Windows, NFPA 80, and National Fire Alarm Code, NFPA 72.1.4 The combination door closers-holders (with or without integral smoke detectors) described in this Standard provide one of the following types of hold open functions:a) Single point hold open.b) Multiple point hold open. (Two, three, four, etc. discrete hold open points as set at the manufacturer's plant.)c) Infinite hold open points with one as set by the user.