A firestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly.
Firestops are designed to maintain the fire-resistance rating of a wall or floor assembly intended to impede the spread of fire and smoke.
Components include intumescents, cementitious mortars, silicone, firestop pillows, mineral fibers, and rubber compounds.
Brattberg Multi-Cable Transit is a firestop system invented by John A. Birmingham and Rogers A. Moore,[4] the patent expired in 2011.
It is used onboard of large steal vessels (Offshore Platforms, ships) when penetration bulkheads, high rise buildings, laboratories, explosions areas and EMI risk.
The Canadian and United States Underwriters Laboratories publish books listing firestop manufacturers who have contracted with them for testing and certification.
Firestops created by contractors or building maintenance personnel which are not listed are not credited with an adequate fire resistance rating for building-code compliance purposes.