CSLB Class B General Contractor's License Practice Exam

In colder climates, which of the following supply air configurations are preferred?

1. Perimeter floor outlets

2. Perimeter ceiling outlets

3. Centered room floor outlets

4. Centered room ceiling outlets

The correct answer is: Perimeter floor outlets

In colder climates, perimeter floor outlets are preferred for supplying air. This configuration is effective because it helps to counteract cold air drafts and provides a heating effect at the ground level where people are located. By distributing heated air from the perimeter of the space, it helps maintain a comfortable temperature at the floor, reducing the likelihood of cold air settling and creating uncomfortable living or working conditions. Perimeter floor outlets work by prompting warm air to rise as it is introduced at the base of the walls or windows, which may be colder due to exposure to the outside elements. This method creates a more uniform temperature throughout the room and enhances comfort. The other configurations, such as perimeter ceiling outlets or centered room outlets (whether in the ceiling or floor), may not effectively address the temperature imbalances caused by cold drafts. They could potentially allow cold air to settle at lower levels or lead to a less effective heating strategy for the occupants in colder regions. Thus, perimeter floor outlets stand out as the most suitable choice to provide warmth where it is most needed.