What is the difference between minimum ventilation and target IAQ in 62.1?

• A. Minimum ventilation is required by VRP; target IAQ is the desired IAQ achieved via IAQP or design strategy.
• B. They are the same concept; just different terms.
• C. Target IAQ is always higher than the minimum ventilation.
• D. VRP sets the target IAQ, not the minimum ventilation.

Answer: (D)

The key idea is distinguishing a fixed baseline requirement from a performance goal. In 62.1, the ventilation rate procedure sets the minimum outdoor-air ventilation needed to meet contaminant control for a space—this is the baseline you must provide to meet the standard. The target IAQ, on the other hand, is the desired indoor air quality you aim to achieve through the IAQ Procedure (IAQP) or other design strategies. It’s a performance goal that can be met with various approaches, such as enhanced filtration, source control, or operating strategies, which may require more or less outdoor air than the minimum, depending on the target.

So the minimum ventilation comes from the VRP as the baseline outdoor-air requirement, while the target IAQ is the aspirational level defined (and pursued) through IAQP or other design strategies. The VRP does not set the target IAQ; it establishes the minimum outdoor air, and the target IAQ is a separate target used in IAQP.