What is a breach in a floor-ceiling or wall assembly to accommodate an item called?

The term used to describe a breach in a floor-ceiling or wall assembly that accommodates an item is referred to as a membrane penetration. This term is specifically used in construction and building codes to define any openings that occur in a barrier system such as walls or floors, which are created to allow for the passage of plumbing, electrical, or mechanical systems.

Membrane penetrations are crucial because they can potentially affect the integrity of the assembly, particularly concerning fire ratings, sound transmission, and moisture control. Proper sealing and fire-stopping materials are typically required at these penetrations to maintain the safety and efficiency of the building's structural elements.

Other terms listed do not accurately describe this concept. For example, an annular space refers to the space between the pipe or duct and the surrounding materials, but it doesn't specifically denote the breach in the assembly. An atrium relates to a large open space, usually within a building, and is unrelated to the concept of penetration. Lastly, an exhausted enclosure may imply a specific type of space designed for ventilation or exhaust purposes but does not reflect the general idea of an assembly breach.