It has two types: filtered and unfiltered. Filtered mask is easier to breathe in different types of filters. FFP filters include the following types:
FFP1: Suitable for particles larger than 5 microns and has 80% filtration.
FFP2: Suitable for particles between 2 and 5 microns and has 94% filtration.
FFP3: Suitable for particles smaller than 2 microns and has 99% filtration.