What is the impact of a balanced ventilation system on indoor air quality?

A balanced ventilation system is designed to supply and exhaust equal amounts of air, helping to maintain a consistent indoor air quality. By ensuring that fresh outdoor air is brought into the living space while simultaneously removing stale indoor air, such a system reduces the accumulation of pollutants, allergens, and moisture that can negatively impact health and comfort.

This method not only helps in maintaining adequate levels of oxygen but also aids in controlling humidity, thereby preventing issues like mold and mildew. By effectively exchanging indoor and outdoor air, a balanced system contributes to a healthier indoor environment, which is crucial for overall well-being.

In contrast, other options suggest negative or neutral effects on air quality. Lowering air quality would be counterproductive to the goal of ventilation systems, while having no impact at all implies a lack of functionality, which does not hold true for balanced systems. Decreasing ventilation effectiveness would also run contrary to the primary purpose of achieving a healthy indoor air environment.