Are all HEPA filters the same

No, research suggests some air purifiers won’t effectively remove the level of airborne pollutants as needed, yet they may be sold as having ‘HEPA-like’ filters. It is important that the HEPA filter in your air purifier is a ‘True’ HEPA filter as defined by the Australian Standards, or other international Standards such as the US Dept. of Energy (DOE) and the European Standards (EN). To meet these Standards, they must have minimum filtration efficiency of 99.97% removal of tiny particles that have a size of 0.3 microns.

All approved Winix models have certified True HEPA grade filters.