What typically allows for air circulation in structures with brick veneer?

Air gaps are essential components in structures with brick veneer because they create a space between the brick exterior and the underlying wall structure. This gap facilitates air circulation, allowing moisture that may accumulate within the wall assembly to escape. Proper ventilation is crucial for preventing mold growth and deterioration of materials due to trapped moisture. By enabling airflow, air gaps help to maintain a balanced moisture level within the walls, which is vital for the longevity and durability of the building.

While humidity barriers, ventilation ducts, and insulation panels can be important in a building's overall design and function, they do not specifically provide the necessary air circulation that air gaps do in a brick veneer system. Humidity barriers might help control moisture levels, but they do not enhance airflow. Ventilation ducts are designed for specific airflow needs and do not relate directly to the brick veneer system itself. Insulation panels serve to improve energy efficiency but do not facilitate air movement in the same way air gaps do.