Fire Damper Maintenance Checklist

A fire damper is installed where ductwork penetrates a fire-rated wall or floor to maintain the fire compartmentation of the building. It operates passively via a fusible link that melts at a defined temperature (typically 72°C), allowing a spring or curtain mechanism to close the damper blades and prevent fire spreading through the duct opening. Fire dampers are a regulatory requirement and must be inspected and drop-tested regularly.

There are two common mechanical types: curtain (folding-blade) dampers, which drop a stack of interlocking blades across the duct, and multi-blade (louvre) dampers driven by a spring. Both rely on a thermal fusible link rather than any electrical signal, which is the key difference from a motorised smoke damper. Where ductwork passes through a compartment line, the damper only works if the surrounding fire-stopping and the damper's fixing into the construction are intact — so fire damper maintenance is inseparable from checking the penetration seal around it.

This page is the maintenance and inspection reference: the physical drop test, fusible link, blade condition and fire-stopping checks an engineer carries out on site. Working out how often each damper is due, and against which risk class, is a scheduling question — use the linked drop test scheduler for next-due dates and an audit-ready record template, and keep this checklist for the work itself.