The #1 Rated Filtration System* Just Got Better! Lennox has combined MERV 16 Filtration with a carbon coated fiber matrix, adding ozone and odor reduction capabilities to the industry's highest efficiency air filter.- 50% First-pass reduction of ozone- Hospital inpatient / general surgery level filtration- Removes over 95% of (sub-micron) particles down to 0.3 microns- Removes over 90% of ultra-fine particles down to 0.1 microns including viruses and bacteria. The Lennox Healthy Climate Carbon Clean 16 MERV 16 Filter has a dark gray color due to the new carbon coated fiber matrix. Dimensions: 20" x 20" x 5"Actual size: 19-3/4" x 19-7/8" x 4-3/8"The Lennox X7935 will remove a minimum of 95% of circulated dust and other particles from 0.3 micron and up and a minimum of 95% of mold spores and other bioaerosols from 0.3 micron and up. See The Lennox MERV 16 .