MINI PLEAT HEPA filters are high-efficiency filters made of hot melt mini pleat filter design and have lower pressure drop that typically captures over 99.99% at 0.3 microns of all particulate pollution. They are made of fiberglass and can capture things like pollen, viruses, bacteria, mold, and PM 2.5 diffusion also. This means they are highly effective at capturing nanoparticles too.