The Enertech Edge - Fire and Air: The Damper Series
UL 555 and UL 555S Dynamic Standards and Testing
Introduction
In 1999, Underwriters Laboratories (UL) updated the dynamic testing requirements for UL 555 Fire Dampers and UL 555S Smoke Dampers, effective June 2001. These revisions strengthened performance verification, eliminated misleading claims, and ensured that all life safety dampers could reliably operate under true dynamic (fans-on) conditions.
This issue of the Enertech Edge includes information about:
- UL 555 Dynamic Fire Damper Testing
- UL 555S Dynamic Smoke Damper Testing
About
Kent Maune is Senior Product Manager, Life Safety and Control Dampers, for United Enertech. His experience during more than 35 years in the HVAC industry (dampers and louvers) includes engineering, R & D, operations, sales, and extensive experience in the development and marketing of life safety product lines. He has also developed and conducted training seminars for code officials, engineers, fire marshals, architects, and sheet metal contractors on fire/smoke damper installation, options, and variations. Kent is a member of NFPA (National Fire Protection Association) and a chair of CARC (Code Action Review Committee). [email protected]
January 2026