The Minimum Efficiency Reporting Value (MERV) is the standard comparison of an air filter’s efficiency. The MERV scale ranges from 1 (least efficient) to 16 (most efficient) and measures a filter's ability to remove particles from 0.3 to 10 microns in size.
Higher MERV rated filters can cause a pressure drop and resulting drag on HVAC equipment, depending on the system. Please consult with your local Carrier expert for the recommended MERV size for your system.