What method is used to classify the efficiency of filters?

The method used to classify the efficiency of filters is the Minimum Efficiency Reporting Value (MERV) rating. This system was developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and provides a standardized measurement of a filter's ability to capture particles of different sizes. MERV ratings range from 1 to 16, with higher values indicating greater filtration efficiency.

When selecting air filters for healthcare environments, it's essential to consider MERV ratings because they directly impact indoor air quality and the effectiveness of controlling airborne contaminants. Filters with higher MERV ratings can trap smaller particles, making them more suitable for settings that require stringent air quality standards, such as hospitals and clinics. This classification method helps professionals ensure they are using the most appropriate filters for their specific environments and needs.