What does a higher MERV rating indicate about an air filter?

A higher MERV (Minimum Efficiency Reporting Value) rating indicates that an air filter is capable of capturing smaller particles with greater efficiency. MERV ratings range from 1 to 16, with higher numbers denoting filters that can trap particles as small as 0.3 microns. This includes allergens like pollen, dust, pet dander, and other fine particulates. Filters with a higher MERV rating are designed to create a cleaner indoor environment by improving air quality through the removal of microscopic contaminants that could affect health, enhance the performance of HVAC systems, and alleviate respiratory issues.

While capturing larger particles (as mentioned in one of the other options) is important, filters with lower MERV ratings are typically adequate for that purpose. Higher MERV rated filters, on the other hand, excel at addressing smaller airborne particles. Additionally, the cost of maintenance and noise levels are not directly related to MERV ratings; instead, the higher efficiency in capturing small particles is the defining characteristic of high MERV rated filters.