Minimum Efficiency Reporting Value
“How can we quantify how effective an air filter is?”
Air filters come in all sorts of varieties. However, sometimes we may need to work on a project or be exposed to conditions that require a desired level of protection. For this reason, the American Society of Heating, Refrigerating and Air-Conditioning Engineers have developed the Minimum Efficiency Reporting Value, commonly referred to as the MERV scale, which quantifies the level of minimum particle size that can be filtered. The scale starts at 1 (for particle sizes greater than 10.0 μm) to 20 (for particle sizes less than 0.3 μm).