MERV 10 air filters are our most popular seller. They are the perfect upgrade from an economy filter and provide excellent filtration for households that don't have allergy or health issues. They are 70% efficient at removing particles from 3-10 microns in size (see examples in the chart below) and have a 100% synthetic media that will not support microbial growth. These filters should be change every 30-90 days depending on your home (check out our "Air Filter Change Frequency" page for additional information). Use the filter finder at the top of the page to find your size.