The A2 Filter combined with appropriate face piece provided with a threaded DIN Rd 40x 1/7" connector, is used for protection against organic compounds whose boiling temperature is higher then 650C and voulmetric concentration in the air does not exceed 0.5%.
The B2 Filter combined with appropriate face piece provided with a threaded DIN Rd 40x 1/7" connector, is used for protection against inorganic compounds when the voulmetric concentration in the air does not exceed 0.5%.
The K2 Filter combined with appropriate face piece provided with a threaded DIN Rd 40x 1/7" connector, is used for protection against ammonia and its derivatives when the voulmetric concentration in the air does not exceed 0.5%.