In a split-level home, how much total area can the levels served by one return be?

In a split-level home, the mechanical code specifies that the total area served by one return air duct must not exceed a certain limit to ensure proper air circulation and efficiency of the heating and cooling systems. The correct choice indicates a total area of 1,600 square feet, which aligns with the standards set forth in the mechanical code for residential applications. This limit helps maintain balanced airflow and prevent issues such as pressure differences that could lead to discomfort or inefficiencies in energy use.

When considering the factors that influence these areas, it's important to recognize that too many square feet served by one return can lead to inadequate airflow, noisy operation, and potentially uneven temperature distribution throughout the home. The code provides these guidelines to ensure that residential heating and cooling systems function optimally, providing comfort while also being energy-efficient.