In summary :
- Cloth mask:
The fabric mask has no scientifically proven effectiveness see the article: COVID-19 spread and effectiveness of cloth masks
- Surgical mask:
It is intended to prevent the projection towards the surroundings of the droplets emitted by the person wearing the mask. It also protects the wearer against projections of droplets emitted by a person opposite. However, it does not protect against inhalation of very small airborne particles. A surgical mask is designed for single use. It should be changed as soon as it becomes wet and at least every 4 hours.
- FFP mask:
It is intended to protect the wearer from both inhalation of droplets and airborne particles, which may contain infectious agents. Wearing this type of mask is more restrictive (thermal discomfort, respiratory resistance) than that of a surgical mask. There are three categories
- FFP1 filtering at least 80% of aerosols (total leakage inside <22%).
- FFP2 filtering at least 94% of aerosols (total leakage inside <8%).
- FFP3 filtering at least 99% of aerosols (total leakage inside <2%).
A removed FFP mask should not be reused. The wearing time must be in accordance with the instructions for use. In all cases, it will be less than 8 hours on a single day.
- The visors:
Visors or face shields are not respiratory protection equipment but eye and face protection equipment. If they can protect the carriers from the large droplets emitted immediately after a cough by a person nearby and facing the screen, they do not protect particles remaining in suspension. They do not have the effectiveness of respiratory protection masks.
- P3 half mask (FFP3):
It is intended to protect the wearer from both inhalation of droplets and airborne particles, which may contain infectious agents. Wearing this type of mask is less restrictive than FFP because the exhalation is done by valves on both sides. A P3 Half Mask can be removed and reused by following the cleaning instructions. The life of a cartridge depends on the pollution and can last in an office environment between several weeks to several months.