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Passive fire dampers which expand to block their aperture upon exposure to elevated temperatures.
Intumescent fire dampers differ from regular fire dampers in that they have no moving parts; instead they expand to many times their normal size upon exposure to elevated temperatures indicative of a fire, forming an incombustible mass which seals its aperture, preventing the spread of fire and hot smoke.
Available in two variants, in both rectangular and circular sizes:
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