It is advisable to use respiratory protections with P3 protection level although in certain circumstances of little probability of coming into contact with the pollutant or low concentration of microorganisms (outdoors, for example) it can be assessed by using levels P2 P2.The most common are self-filtering masks.In its denomination at the level of protection ‘FF’ is put before.
There are different options in the market: molded, folded, with valve, without valve.It must be said that the level of protection is independent of the way or not to carry exhalation valve
If there were the presence of vapors, you have to resort to masks with filters with one stage with active carbon and another for particles.
The EPI seen above are all of negative pressure;This means that the user is the one who has to make the effort so that the air passes through the filter material or the filters.The higher the level of protection or more filtration stages, carry the combined filter;greater will be the effort.
When there are biological risks associated with group 3 or 4 agents it would be convenient to use motorized equipment connected to a protective hood with viewfinder.These provide additional protection since they create a positive pressure within the hood and work, and in addition, its use is more comfortable.Abek filters are usually used.
