Which type of system must be approved if used in the corridor return air system?

An engineered smoke control system is specifically designed to manage and control the movement of smoke within a building, particularly in the event of a fire. Such systems are critical in providing a safe environment for occupants by ensuring that smoke is effectively mitigated, and they play a significant role in maintaining clear evacuation routes through corridors.

In the context of a corridor return air system, the use of an engineered smoke control system is essential because corridor spaces often serve as vital pathways for not only air circulation but also for evacuating occupants during emergency situations. This requirement is part of fire safety codes that necessitate specific systems to be approved to ensure that they meet the standards for smoke management and air movement. This approval process is crucial for ensuring both functionality and compliance with safety regulations.

In contrast, other types of systems like a standard HVAC system may not address the unique challenges posed by smoke management in corridors. Point-source filtration systems and dual ventilation systems may also have their applications, but they do not provide the same level of comprehensive smoke control and are therefore not mandated for corridor return air applications in scenarios where safety measures are essential.