A fire damper is a safety device installed in HVAC ductwork to stop fire and smoke from spreading through a building. When heat rises to a set temperature, a fusible link releases and the damper closes, sealing the duct opening in fire-rated walls or floors. Fire dampers are required by building codes in many commercial and multi-family properties.
/ˈfaɪər ˈdæmpər/
A fire damper is a safety device installed in HVAC ductwork to stop fire and smoke from spreading through a building. When heat rises to a set temperature, a fusible link releases and the damper closes, sealing the duct opening in fire-rated walls or floors. Fire dampers are required by building codes in many commercial and multi-family properties.
What does a fire damper do in HVAC?
It closes during a fire to block flames and smoke from traveling through ductwork.
Source: The Cooling Company
Fire dampers close during heat events to block spread.
In a multi-story office, fire dampers close at duct penetrations to limit smoke and fire travel, giving occupants more time to evacuate.
Schedule regular fire damper inspections to meet code requirements and ensure reliable closure.
“Schedule regular fire damper inspections to meet code requirements and ensure reliable closure.”
Fire damper requirements date back to 19th‑century fire codes, but modern materials have improved reliability.
Do fire dampers need inspection?
Yes. Codes typically require periodic testing and documentation.
What’s the difference between fire and smoke dampers?
Fire dampers block flames; smoke dampers control smoke movement. Combination dampers do both.
Where are fire dampers installed?
At duct penetrations through fire-rated walls, floors, or partitions.
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