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Respirator - Mask Filters
A respirator is a device designed to protect the wearer from inhaling harmful dusts, fumes, vapors, or gases. Respirators come in a wide range of types and sizes used by the military, private industry, and the public. Respirators range from cheaper, single-use, disposable masks to reusable models with replaceable cartridges.
Please visit Wikipedia for more detailed inofrmation
http://en.wikipedia.org/wiki/Filter_mask
European standard EN 143 defines the following classes of particle filters that can be attached to a face mask:
| Class | Filter penetration limit (at 95 L/min air flow) |
|---|---|
| P1 | Filters at least 80% of airborne particles |
| P2 | Filters at least 94% of airborne particles |
| P3 | Filters at least 99.95% of airborne particles |
