CSLB Class B General Contractor's License Practice Exam

When penetrating a roof with an exhaust, the exhaust must be no closer than _____ feet to any air intake or openable window.

1. 3 feet

2. 5 feet

3. 10 feet

4. 15 feet

The correct answer is: 10 feet

The requirement for positioning exhaust systems in relation to air intakes or openable windows is primarily driven by the need to prevent harmful exhaust gases from re-entering buildings, which could impact indoor air quality and pose health risks. The code specifies a minimum distance to ensure that these exhaust fumes do not compromise the air that is drawn into the building, maintaining a safe environment for occupants. Setting this distance at 10 feet is a precautionary measure that accounts for various factors, such as wind direction and potential obstructions, that might affect how exhaust fumes disperse. By requiring a greater separation, the code helps to ensure that any emissions are effectively diffused before they have the potential to affect intake systems or openable windows, ultimately promoting safer living and working conditions. This standard represents best practices in building design and ventilation management, supporting safety and health regulations in construction and renovation projects.