CSLB Class B General Contractor's License Practice Exam

What type of air handling system design provides a return air pathway at central locations of each floor back to the air handler?

1. Local return duct system

2. Forced air system

3. Central return duct system

4. Split air conditioning system

The correct answer is: Central return duct system

The central return duct system is designed to draw air from various locations within a space and return it to the air handling unit for reconditioning. This system typically includes ducts that are installed centrally on each floor, allowing for efficient airflow management. By providing a return air pathway at central locations, the system can more effectively balance the air pressure and ensure constant air circulation. This design helps to maintain consistent temperature and humidity levels throughout the space, which is particularly important in larger buildings or multi-floor structures. In contrast, a local return duct system would typically involve return air pathways that are directly associated with specific zones or areas rather than central return points. A forced air system generally refers to the method of moving air using fans and does not inherently suggest the design of the return air pathways. Lastly, a split air conditioning system is focused primarily on cooling and might not utilize a centralized return duct design, as it usually relies on individual components installed in separate zones.