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The best way to protect yourself from the hazards of fine dust generated during woodworking operations such as sanding, routing, sawing or turning is to wear a respirator mask. Respiratory filters are divided into 3 protection classes according to EN143 and are usually given a nominal protection factor (NSF). The NSF indicates the ratio of the concentration of pollutants in the air and inside the respirator.
P1 = 80 %, NSF 4
P2 = 94 %, NSF 10
P3 = 99.95 %, NSF 40
Respirators against gases and vapours have activated carbon filters responsible for the physical and/or chemical absorption of hazardous substances. These are highlighted by marked letters and colours.
A = Organic gases and vapours with a boiling point above 65°C
Class 1, 2, 3
B = Inorganic gases and vapours (excluding carbon monoxide)
Class 1, 2, 3
There are 3 protection classes for each type of gas filter, depending on the amount of pollutants the filter can absorb.
Therefore, the choice is based on the predicted concentration of the pollutant:
1 = low / 1,000 ppm
2 = medium / 5,000 ppm
3 = high / 10,000 ppm
