Which of the following statements about air supply rates is true?

The correct answer highlights that supply rates vary based on usage. This is crucial for understanding indoor air quality because different spaces have different activities, occupancy levels, and needs for fresh air. For example, a residential kitchen may require higher air supply rates due to cooking activities that produce pollutants, while a typical office space might have different requirements based on the number of occupants and the activities that take place.

Various factors influence the appropriate air supply rates for a given space, including the type of building, its occupancy, the presence of contaminants, and regulatory guidelines. HVAC systems are designed to account for these variations to maintain optimal air quality and comfort.

The other statements do not accurately reflect the complexities of air supply rates. There is no universal standard for every scenario—standards can differ based on building codes, health guidelines, and specific use cases. The idea that supply rates are irrelevant to air quality is incorrect, as proper ventilation is essential to reducing pollutants and maintaining a healthy indoor environment. Claiming that all buildings require the same supply rate overlooks the unique demands of each space based on its various functions and occupant needs.