这些要求涵盖了“镀锡”防火门的设计和构造，防火试验证明，当按照CAN/ULC-S104《门组件防火试验标准方法》进行试验时，防火性能足以保证其在防火等级不超过3小时的封闭组件中使用。符合这些规范的门基本上由一层相互钉牢的木板组成，用燕鸥或锌板包裹，在边缘连接在一起，并通过接缝钉牢在门芯上。表1给出了按照这些规范建造的三层和两层门的尺寸和额定值。这些额定值旨在使监管机构能够确定本标准中所述的门组件是否适用于需要规定耐火时间的场所。 “镀锡”防火门的安装细节要求，包括通风孔的要求，包含在NFPA 80《防火门和其他开口保护装置标准》中。表1仅适用于开口的最大尺寸。受本表限制的门分为两类:一类是安装在开口内的摆动门；和b所有滑动门和拟安装在外部表面的旋转门 开放

These requirements cover the design and construction of "tin-clad" fire doors which have demonstrated in fire tests, fire performance properties sufficient to warrant their use in closure assemblies having a fire-protection rating of up to and including 3 h, when tested in accordance with CAN/ULC-S104, Standard Method for Fire Tests of Door Assemblies.A door conforming to these specifications consists essentially of a core made up of layers of boards nailed to each other, encased in terne or zinc plates jointed together at their edges and nailed through the seams to the core.The sizes and ratings for three-ply and two-ply doors, constructed in accordance with these specifications, are given in Table 1. These ratings are designed to enable regulatory bodies to determine the suitability of the door assemblies described in this Standard for use in locations where a fire resistance of a specified duration is required. Requirements for the details of the installation of "tin-clad" fire doors, including the requirements for vent holes, are included in NFPA 80, Standard for Fire Doors and Other Opening Protectives.Table 1 pertains only to the maximum size of the opening. Doors limited in size by this table fall into two categories:A Swinging doors intended to be installed within an opening; andB All sliding doors and those swinging doors intended for surface mounting outside of the opening.