The 3M™ Fire Barrier Cast-in Device for Metal Pipes 3MCID is an intumescent device that firestops 3-inch (76.2 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.The 3M Fire Barrier Cast-in Device for Metal Pipes 3MCID creates an opening through which mechanical, electrical or plumbing penetrants can be routed after the slab is cured and forms are removed. The device is installed prior to the concrete pour creating a firestop sleeve through which a 3 inch penetrant (e.g. metal pipe) may be passed. It helps prevent the spread of fire, smoke and noxious gas through the penetration opening, and provides up to 3-hour fire protection. 3M Fire Barrier Cast-In Devices can be used with the following accessories: 3M Fire Barrier Cast-In Metal Deck Adaptor to accommodate fluted metal decks, 3M Fire Barrier Cast-In Device Height Adaptor to accommodate up to 12 in. (304.8 mm) concrete thickness, 3M Fire Barrier Cast-In Aerator Adaptor for aerator systems (use only with 4 in. 3M Fire Barrier Cast-In Devices), and 3M Fire Barrier Cast-In Tub Box Assembly to create a void for plumbing access (for use only with 2 in. metallic (50.8 mm) 3M Fire Barrier Cast-In Devices).