What does ANSI/ASHRAE 52.2 - 2012 primarily measure?

The standard ANSI/ASHRAE 52.2 - 2012 primarily measures the Minimum Efficiency Reporting Value (MERV) of air filters. This measurement is significant because it evaluates how effectively an air filter can capture particles of varying sizes from the air, specifically using a test aerosol composed of potassium chloride. By using a standardized method concerning specific sizes and types of particulate matter, the standard provides a reliable way to compare the performance of different air filtration products.

Understanding MERV is crucial for ensuring that air filters meet the necessary efficiency requirements for different applications. A higher MERV rating indicates better filtering capability, which directly impacts indoor air quality and system performance. This measurement is especially important in environments where air cleanliness is critical, such as hospitals and clean rooms.

The other options relate to different aspects of HVAC systems or performance evaluation but do not specifically pertain to the primary focus of the ANSI/ASHRAE 52.2 - 2012 standard.