Beyond HEPA standards, the worldwide patented VENTAcel Nelior Filter takes indoor air filtration to the next level. The advanced filter technology removes indoor air pollutants such as pollen, mold spores, pet dander, dust mites, cigarette smoke, bacteria, viruses, and other volatile organic compounds (VOCs) down to 0.07 microns with a total filtration capacity of more than 99.95%. Composed of a particle-arresting microscopic fiber lattice, the Nelior technology results in lower operating pressure differential and the highest filtration efficiency. This performance is unsurpassed by all other HEPA and ULPA filters currently available on the market. The VENTAcel Nelior Filters are durable and lightweight, and only need to be replaced approximately every six months, if run continuously (24/7). Your Venta unit will notify you when it is time to replace the filter with a Change Filter notification.