Fire resisting ductwork is generally used when protection from the spread of fire from one compartment to another cannot be achieved using conventional thermally-actuated (fusible link) fire dampers

Ventilation systems which need to continue to operate under emergency / fire situations cannot use thermally actuated, fusible link type dampers. In such applications, the closing of dampers due to the elevated temperatures would prevent the system from supplying air to, or extracting air from, the required zones.

In addition, Kitchen Extract systems should not have fire dampers incorporated due to the high operating temperatures within the duct in normal use. The build-up of grease and carbon deposits resulting from the cooking process is also likely to prevent the damper from closing fully.

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