High-efficiency particulate air filters (HEPA) are critical in the prevention of the spread of airborne bacterial and viral organisms. In conjunction with personal protective equipment (PPE), this type of filtration greatly reduces the risk of infection for emergency medical service operators, as well as drivers and passengers. The Webasto HFT 300 and HFT 600 are capable of removing 99.995% of airborne particulates. Each unit complies with the International HEPA Filter standards WHO / CDC / ECDC, requiring 60 air changes per hour for infection control.