GAS MASK FILTER Russian patent published in 1999 - IPC

FIELD: cleaning air in working zone from vapors of toxic agents. SUBSTANCE: gas mask filter has cylindrical housing with threaded neck for connecting the filter to mask, two-layer charge including layers of desiccant and hopcalite located in succession in way of flow of air, filtering material layer located between layer of hopcalite and threaded neck, bottom with inner threaded neck and charge fastenings. Ratio of length of hopcalite layer to length of desiccant layer ranges from 0.8 to 1.1. EFFECT: improved quality of cleaning air; increased service life; enhanced reliability. 3 dwg