Wiremold® FlameStopper™ Thru-Wall Fittings are a giant step forward
in fire-stop technology. In the event of a fire, intumescent
material inside the fittings expands to stop the spread of fire to
the other side of the wall. FlameStopper fittings offer a passive
fire and life safety system with ratings of up to 4 hours to complement
existing sprinkler systems. FlameStopper fittings make it easy to add
additional cables after installation. And, they're designed to work
seamlessly with our cable tray products.