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Firestopping Through-Wall Cable Penetrations
Flamestopper thru-wall fittings consist of two box assemblies, each with
adjustable steel doors. The boxes are attached to EMT conduit, and
cables pass through a block of intumescent material inside each
assembly. If the temperature reaches approximately 375°F, the material
expands, creating a hard char that fills voids around the cables and
stops flame from penetrating the opening. When tested to UL 1479
standards, FlameStopper achieved F (flame) and T (temperature) ratings
of up to 4 hours. It also earned a low rating for air leakage, making it
a highly effective smoke stop.
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