Return air should not be taken from which of the following locations?

Return air should not be taken from areas like the closet, bathroom, and toilet room due to the potential presence of contaminants and odors. These spaces are generally not designed for air distribution within a home, and the air in those areas may contain moisture, humidity, or pollutants that can lead to ineffective ventilation and indoor air quality issues.

Taking return air from bedrooms or living spaces, like those listed in other answer choices, is preferable because these areas typically contain air that is more representative of the overall living environment, contributing positively to effective air circulation and comfort in a home. Keeping return vents out of bathrooms helps to maintain better humidity control and avoid unpleasant odors being circulated throughout the home. Additionally, areas like laundry rooms may also harbor lint, moisture, and various odors that could detract from indoor air quality, which is why they are also not preferred for return air.