FFP2 or FFP3 mask for virus prevention A single-use FFP2 or FFP3 mask is a disposable filtering respiratory protection device against particles and aerosols (small water droplets that may contain influenza viruses or coronaviruses, for example). The disposable FFP2 or FFP3 mask is intended to protect the wearer against the inhalation of infectious agents transmissible via the air we breathe. It also protects it against the risk of transmission by droplets.