The SHIVA-NRP50 Commercial Grade Air Purifier was designed to operate based on patented Shiva Air Sterilisation Technology. This means it can operate internally with windows closed (unlike traditional HEPA Air Purifiers which still require an adequate form of ventilation). The technology was designed and patented by one of the SHIVA Directors in March 2018, and is fully tested & certified to deactivate airborne bacteria and viruses including H1N1, Rhinoviruses, and Coronaviruses, along with with multiple other Allergens, Pollutants, VOC’s & Odours.