California Residential Inspector Practice Exam

How far must at least one under-floor ventilation opening be located from each building corner?

1. 2 feet

2. 3 feet

3. 4 feet

4. 5 feet

The correct answer is: 3 feet

Under California building codes, specifically the California Residential Code, the requirement for under-floor ventilation is in place to promote air circulation and prevent moisture buildup, which can lead to issues such as mold growth and wood rot. To ensure proper ventilation, there is a regulation stipulating the minimum distance that an opening must be from each building corner. The correct answer, three feet, reflects the need to provide adequate airflow while considering structural elements of the building. This distance helps to ensure that ventilation systems can deliver fresh air effectively throughout the under-floor space and minimizes potential obstructions that might arise from close proximity to corners. This requirement is critical because corners can have structural features, such as foundation walls or piers, that could impede the flow of air if ventilation openings are positioned too closely. By mandating a three-foot distance, the code effectively balances both ventilation needs and structural integrity, creating an environment that is conducive to the health of the building and its occupants.