In a dwelling unit, the use of corridors for conveying return air is:

In residential buildings, the use of corridors for conveying return air is prohibited due to concerns related to air quality, fire safety, and system efficiency. When return air is conveyed through corridors, it can lead to the mixing of air from various living spaces that may not be properly conditioned, potentially introducing contaminants or odors into the system. Furthermore, from a fire safety perspective, allowing air movement through corridors can create pathways for smoke spread in the event of a fire, undermining safety measures designed to protect occupants.

Understanding these implications is crucial in adhering to the North Carolina Mechanical Code, which aims to ensure that HVAC systems promote healthy indoor environments and maintain safe conditions in residential buildings. This prohibition also guides builders and designers in creating more efficient and safe HVAC configurations by encouraging return air pathways that do not compromise the overall integrity of the building’s air management system.