UL 555S:5ED 2014-02

Foreword
Introduction
1. Scope
2. General
    2.1 Components
    2.2 Units of measurement
    2.3 Undated references
3. Glossary
Construction
    4. General
    5. Protection Against Corrosion
    6. Actuators
Performance
7. General
8. Cycling Test
9. Temperature Degradation Test
10. Leakage Tests
11. Operation Test
    11.1 General
    11.2 Method
    11.3 Multiple assembly
12. Salt-Spray Exposure Test
13. Fire Exposure Test
14. Accelerated Aging Test
15. Hydrostatic Strength Test for Pneumatic Actuators
Classification
16. General
Marking
17. General
Installation and Operating Instructions
18. General

This revision of ANSI/UL 555S dated October 9, 2020 includes an additional option for Protection Against Corrosion; 5.1

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 barriers when the HVAC system is part of an engineered smoke control system.