Protective face masks for protection against viruses, droplets, aerosols, particulate, airborne matter, and germs, with and without filters and removable filters; disposable sanitary masks and reusable sanitary masks worn to cover the nose and mouth to prevent the spread of infection and inhalation of viruses, droplets, aerosols, particulate, airborne matter, and germs, with and without filters and removable filters; respirators for filtering air, with and without filters and removable filters; filters for respiratory masks and reusable sanitary masks; mask fitters and mask braces for placing over disposable and reusable masks when in use to prevent air leaking around the edges thereof

Air filtering, disinfecting, and purifying systems and components for use and installation in heating, ventilation, and air conditioning (HVAC) systems, namely, filters and UV light sources for disinfection; Portable air purifier systems; Air filtering, disinfecting, and purifying components for installation in portable air purifier systems; heat exchange and energy recovery units for installation in heating, ventilation, and air conditioning (HVAC) systems; UV light sources for disinfection of ambient air, and components for installing UV light sources in rooms and indoor and outdoor spaces