The Enertech Edge - Dynamic Fire Dampers: Evolution, Testing, and System Implications
Introduction
Prior to 1992, fire and smoke dampers were tested and rated only under static conditions, meaning HVAC system fans were off during operation. In 1992, Underwriters Laboratories (UL) introduced a distinction between Static (Fans Off) and Dynamic (Fans On) fire damper systems.
This change reflected the reality that modern HVAC and smoke control systems often remain operational during a fire. Dynamic fire and smoke dampers must close against a moving airstream, a critical feature for maintaining life safety in active air systems.
This issue of the Enertech Edge includes information about:
- Dynamic Fire and Smoke Damper Testing
- Transition from Static to Dynamic Designs
- System Effects of Dynamic Fire Dampers
- Limitations of Traditional Fusible-Link Fire Dampers
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]
March 2026