Features:
1) HEPA stands for High Efficiency Particulate Air
2) These filters are designed to remove up to 99.97% of airborne
pollutants, at 0.3 microns or larger, from the air that passes
through the filter
3) These include tobacco smoke, household dust, pet dander and
pollen
4) 99.97% HEPA filters typically need to be replaced every 12  18
months for best performance
5) 99% HEPA filters typically need to be replaced every 4  6 months
for best performance