ASHRAE 62.1's IAQ Procedure

• A. Maintains contaminant concentration
• B. Increases outdoor air to 100% for all spaces
• C. Eliminates humidity entirely
• D. Focuses on energy usage over air quality

Answer: (A)

The main idea here is that the IAQ Procedure in ASHRAE 62.1 is a compliance path that centers on keeping indoor pollutant levels under control by comparing your design to a reference building. It uses a mass-balance approach to show that the proposed system maintains contaminant concentrations no worse than the reference design, often allowing for energy savings or reduced outdoor air if the IAQ target is met.

So the best choice reflects that aim: indoor contaminant concentrations are maintained at or below the level achieved by the reference design. It’s not about forcing 100% outdoor air for all spaces, eliminating humidity completely, or prioritizing energy use over air quality.