Wall exhaust fans are designed to remove stale, humid, or contaminated air from a specific room or area within a building, directly expelling it to the outside. These fans are typically mounted on the exterior walls of a building and are particularly effective in spaces where air quality needs to be controlled but roof ventilation isn't feasible or practical.

Commonly used in bathrooms, kitchens, workshops, and commercial spaces, wall exhaust fans help in reducing moisture levels, clearing smoke, removing cooking odors, and preventing the buildup of mold and mildew.

In HVAC systems, the primary difference between supply fans and exhaust fans lies in their direction of airflow and their purpose. A supply fan is designed to bring fresh air into a building or a specific space, contributing to the ventilation and air circulation within the indoor environment.

An exhaust fan is responsible for removing stale, humid, or contaminated air from the interior of a building, expelling it to the outside. This helps in controlling and reducing levels of pollutants, moisture, and odors, thereby maintaining a healthy indoor atmosphere.