Vioxfilter H14AF20201 Pack of 1 MERV 14 Pleated 20x20x1 AC Furnace Air Filter with Active Carbon; Low resistance to Air Flow; Convert your A/C into an Air Purifier Key Features: - The Manufacturer Decided to Market it as MERV 14 but actually achieved MERV 15 ASHRAE Certification - Minimizes the Level of Pollution by PM 2.5 (Dust, Ash Soot, Metal Particles, Cement, and Pollen, among others). Helps remove smoke and other chemicals, as well as bad odors - Filters Pollen, Standing Dust, Carpet Fibers, Hair Spray, Fabric Protector, Cement Dust, Lead Dust, Milled Flour, Most Tobacco Smoke, Most Face Powders, Most Paint Pigments - Allows Cleaner Air to Pass Through: Low Resistance to Air Flow, similar to a MERV 13 Air Filter - 3 in 1 technology: Pre-Filter + Carbon Cells + Pleated Non-Woven Fabric - Sturdy Double-Wall Frame Design - Moisture Resistant - Designed for Household Use but can be used in Hospitals, Laboratories, Schools, Universities, Museums, and Commercial Office Buildings