Partitions are used to isolate rooms from noise and to protect rooms from the spread of fire. The International Building Code (IBC), the most common model for state and local codes, refers to these as fire partitions.

When electrical outlets are recessed into these partitions and outlets on opposite sides of the wall are within 24-inches horizontally from each other, they are required to have special wall opening protective measures to prevent fire spread – referred to as the 24-inch Rule by electricians (IBC 714.3.2).

Fire partitions are rated for 1-hour and are required as separations for dwelling units in apartments, condominiums, student housing and assisted living facilities. They are also required to separate sleeping rooms in hotels and dormitories. These are the same partitions where sound control is desired and required by the Code (IBC 1207.2).

The STC Intumescent Insert is an electrical box insert that is UL-listed and certified as a wall opening protective material for one-hour and two-hour fire partitions (R38040). It is sold separately or with the Box Seal as a set at deep discount.