What benefit does the fresh outdoor air provide in an ERV system?

In an Energy Recovery Ventilation (ERV) system, introducing fresh outdoor air plays a pivotal role in improving overall air quality. The primary function of an ERV system is to continuously circulate indoor air while allowing fresh outdoor air to enter and replace stale indoor air. This process helps dilute indoor pollutants, reduce odors, and ensure adequate levels of oxygen within the living or working environment.

The fresh outdoor air contributes to a healthier indoor atmosphere by minimizing the concentration of harmful substances, such as volatile organic compounds (VOCs), carbon dioxide, and other contaminants that can accumulate in closed spaces. This is especially crucial in tightly sealed buildings where air circulation can be limited. As a result, occupants experience better health, comfort, and productivity due to enhanced air quality.

While the other options may have their own relevance in different contexts, they do not directly align with the fundamental purpose of fresh outdoor air in an ERV system, which is centered around air quality improvement.