Shipping is free. Ozone Free: Levoit air purifiers avoid using UV-C light, an air cleaning method that research has shown can produce harmful ozone and secondary pollution. High Performance: Enjoy fresh air in 12 minutes with the Core. 300 True HEPA Air Purifier. Featuring VortexAir Technology and 360° air intake, the Core 300 refreshes the air 5x per hour in rooms as large as 219 ft² / 20 m².