UL555S：Standard for Smoke Dampers
UL555S：防烟阀标准
UL555S防烟阀标准 – 适用范围
这些要求涵盖旨在用于加热，通风和空调（HVAC）系统的烟雾调节器。
防烟阀的用途是：
a）限制设计成在发生火灾时自动关闭的HVAC系统中的烟雾传播；
b）当HVAC系统是工程烟雾控制系统的一部分时，有助于控制跨烟雾屏障的压差。
These requirements cover smoke dampers intended for use in heating, ventilating, and air conditioning (HVAC) systems.
Smoke dampers are intended:
a) To restrict the spread of smoke in HVAC systems that are designed to be automatically shut down in the event of a fire, or
b) To assist with the control of pressure differentials across smoke briers when the HVAC system is part of an engineered smoke control system.