MERV is an acronym that stands for “Minimum Efficiency Reporting Value.” It is a rating system used to measure the effectiveness of air filters in removing contaminants from the air. The higher the MERV rating, the more efficient the air filter is at removing small particles from the air. The MERV rating scale ranges from 1 to 16, with 1 being the least efficient and 16 being the most efficient. Most residential HVAC systems use air filters with a MERV rating of 8 to 12. Filters with a higher MERV rating are typically used in commercial or industrial settings, where air quality is more critical.