What is one common way to demonstrate the effectiveness of Indoor Contaminant Control?

Regular duct cleaning is a common way to demonstrate the effectiveness of Indoor Contaminant Control because it directly addresses the accumulation of dust, allergens, and other contaminants that can circulate in indoor air. Maintaining clean ductwork helps ensure that the air being delivered throughout a building is free from pollutants that can negatively impact indoor air quality. Regular cleaning of these systems is part of a broader strategy to manage and minimize indoor contaminants, contributing to a healthier indoor environment for occupants.

In contrast, the other choices focus on different aspects of construction or building operation. High-efficiency appliances improve energy use but do not specifically pertain to contaminant control. Photovoltaic systems relate to renewable energy generation and environmental impact rather than indoor air quality. Low-flow fixtures are designed to conserve water and energy, which is beneficial for sustainability but does not directly address indoor air quality issues.