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This filter is designed to protect the end user from every known threat. The filter type category is A2B2E2K2P3 which protects against:
A (Brown) Organic gases and vapours with boiling point greater than 65 degrees C (maximum 5000ppm permissible concentration)
B (Grey) Inorganic gases and vapours, e.h. chlorine, hydrogen sulphide, hydrogen cyanide, but not carbon monoxide. (maximum 5000ppm permissible concentration)
E (Yellow) Sulphur dioxide, hydrogen chloride and other acid gases (maximum 5000ppm permissible concentration)
K (Green) Ammonia and organic ammonia derivatives (maximum 5000ppm permissible concentration)
Hg-P3 (Red/White) Mercury
The performance of this filter complies with EN 141, 143, and 371 as well as other regulations.