The Enertech Edge, Fire and Air: The Damper Series
Fire Dampers: History, Function, and Limitations of Fusible Link Designs
Introduction
Fire dampers are a critical component of a building’s passive fire protection system. Installed in HVAC ductwork, they prevent the spread of flame through fire-rated walls, floors, and partitions. While their function has remained the same for decades, the design, materials, and actuation methods have evolved significantly to meet modern life safety and performance requirements.
This paper, by Kent Maune, Senior Product Manager, Life Safety and Control Dampers, for United Enertech, reviews the origin and development of fire dampers, explains the operating principles of fusible link designs, and discusses their practical limitations in contemporary HVAC systems.
This issue of The Enertech Edge discusses:
- Historical Background
- Curtain-Style Fire Damper with Fusible Link Latch
- Fusible Links and Fuse Rods
- Multi-Blade Fire Dampers with Fusible Rods
- Limitations of 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]
January 2026