What type of ventilation systems recover and reuse energy from exhaust air?

Energy Recovery Ventilation Systems are designed specifically to recover energy from exhaust air. These systems use heat exchangers to transfer energy (thermal energy) from the outgoing stale air to the incoming fresh air, thereby conditioning it before it enters the space. This process helps to maintain indoor air quality while also improving energy efficiency by reducing the load on heating or cooling systems.

In contrast, other types of ventilation systems do not have this energy recovery feature. For example, exhaust ventilation systems primarily serve to remove stale air without reclaiming any energy from it. Balanced ventilation systems bring in fresh air while exhausting an equal amount of stale air, but they do not necessarily recover energy; they simply balance the airflow. Lastly, natural ventilation systems rely on passive airflow through windows, doors, and vents without any mechanical assistance or energy recovery capabilities.

Thus, the focus of energy recovery in ventilation is what distinguishes Energy Recovery Ventilation Systems from the other types listed.