What does the term 'through penetration' refer to in the context of firestopping?

The term 'through penetration' in the context of firestopping specifically refers to a passage created for utilities through fire-resistant assemblies. These assemblies are designed to prevent the spread of fire and smoke between different areas of a building, and any openings created for pipes, cables, or ducts must be properly sealed to maintain the integrity of the fire-rated barrier.

When utilities pass through these barriers, it is essential to use firestop materials to seal the gaps, ensuring that fire cannot travel through these openings. This is crucial in building safety and compliance with fire protection codes, which mandate that any penetrations must be addressed to minimize potential fire hazards. Proper firestopping methods will not only help in containing a fire to its origin but also provide additional time for occupants to evacuate safely.