What is the required cross-sectional area for an areaway if the duct termination is less than 12 inches?

The required cross-sectional area for an areaway with a duct termination of less than 12 inches is specified in the North Carolina Mechanical Code to ensure adequate airflow and ventilation. The correct answer of 200 square inches reflects the need for sufficient area to allow for proper exhaust or intake of air, which is critical in maintaining air quality and system efficiency.

This requirement takes into account the size of the duct as well as the need to minimize any resistance to airflow that could lead to inefficiencies in the heating, ventilation, and air conditioning (HVAC) system. Having a well-defined cross-sectional area helps to facilitate the necessary air movement while also minimizing noise and preventing the potential issues that can arise from an undersized duct system. Inadequate area can lead to increased static pressure, which in turn can strain the mechanical system and reduce its lifespan. Thus, a minimum of 200 square inches is set as a best practice for duct terminations under this specification.