The Passive Fire Protection Handbook: Chapter 7 - Penetration Seals

In every application discussed in this handbook, irrespective of whether it is using a Promat product or system, the importance of sealing any gaps in fire resisting constructions is vital to ensure the system works to its maximum ability to save life and property. Such gaps are typically at service penetrations through walls and floors, but would also include gaps left for structural movement and gaps due to poor workmanship.