What is the size restriction for tenant spaces where corridors can convey return air, specifically in square feet?

The correct answer is 1,000 square feet because the North Carolina Mechanical Code specifies that tenant spaces must not exceed this area for corridors to be used as return air pathways. This restriction is primarily based on ensuring adequate air quality and circulation within the space. If tenant spaces are larger than this limit, the risk of insufficient air exchange increases, leading to potential issues such as stale air accumulation and inadequate cooling or heating. This limit helps establish a balance between effective ventilation and the practical considerations of air movement in commercial and residential properties.

Adhering to this guideline ensures that mechanical systems can operate efficiently while maintaining health and safety standards within the building. By keeping the size of tenant spaces within this limit, it allows corridor systems to perform their role effectively in maintaining indoor air quality.