Which type of penetration goes through an entire construction assembly?

Through penetration refers to any type of penetration that extends entirely through a construction assembly, such as a wall or floor. This is crucial in firestop applications because any openings that permit flames, smoke, or heat to pass through must be adequately sealed to maintain the integrity of fire-rated assemblies.

In the context of fire protection, through penetrations often involve items such as pipes, ducts, or electrical conduits that run from one side of a wall or floor to the other. Proper firestop installations at these points are essential to prevent fire spread and maintain the overall fire resistance of the structure.

Understanding through penetrations is important in the context of building safety regulations and fire protection standards, as neglecting to adequately address these penetrations can lead to significant fire hazards. Other types of penetrations, like membrane penetrations or head-of-wall joints, do not penetrate the entire assembly, which is why they do not fit the definition provided in the question.