Lennox Carbon Coated X6672 Healthy Climate MERV 16 Filter (5 Pack) Filter dimensions: 16" x 25" x 5" (Actual size: 15.65" x 24.65" x 4.31") 50% First-pass reduction of ozone Hospital inpatient / general surgery level filtration - Removes over 90% of ultra-fine particles down to 0.1 microns including viruses and bacteria. Removes over 95% of (sub-micron) particles down to 0.3 microns Genuine Lennox OEM Furnace Filter