UL 555:7ED 2006-07-12

Foreword
Introduction
1 Scope
2 General
3 Glossary
Construction
4 General
5 Heat responsive devices
6 Sleeves
7 Protection against corrosion
8 Actuators
Performance
9 General
10 Fire endurance and hose stream test
11 Cycling test
12 Dust loading exposure test
13 Salt-spray exposure test
14 Spring closing force test
15 Operation test
16 Temperature degradation/cycling test
17 Duct impact test
18 Hydrostatic strength test for pneumatic actuators
Marking
19 General
Installation and operating instructions
20 General
Appendix A - Standard for components
Appendix B - Standard time-temperature curve for control
             of fire tests

This revision of ANSI/UL 555 dated October 9, 2020 includes an additional option for Protection Against Corrosion; 7.1

The fire dampers covered by these requirements are intended for installation in accordance with the National Fire Protection Association Standard for Installation of Air-Conditioning and Ventilating Systems, NFPA 90A, the International Mechanical Code and the Uniform Mechanical Code.