3M 4MCID Fire Barrier Cast-In Device

Intumescent device that firestops 4-inch (101.6 mm) metallic penetrations through fire-rated concrete floor assemblies. The device is installed by attaching directly to the form before a concrete slab is poured. Creates an opening through which mechanical, electrical or plumbing penetrants can be routed after the slab is cured and forms are removed. Provides up to 3-hour fire protection.