UL555S防煙閥標準 – 標準名稱
UL555S：Standard for Smoke Dampers
UL555S：防煙閥標準
UL555S防煙閥標準 – 適用范圍
這些要求涵蓋旨在用于加熱，通風和空調（HVAC）系統的煙霧調節器。
防煙閥的用途是：
a）限制設計成在發生火災時自動關閉的HVAC系統中的煙霧傳播；
b）當HVAC系統是工程煙霧控制系統的一部分時，有助于控制跨煙霧屏障的壓差。
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.
