FILTERING PORTABLE SELF-RESCUER Russian patent published in 2001 - IPC

FIELD: individual respiratory organ protecting facilities. SUBSTANCE: filtering portable self-rescuer has veil, cartridge containing anti-aerosol filter, dessicant and hopcalite layers successively arranged in air flow direction, and inhalation and expiration valve system. Volume ratio of dessicant and hopcalite layers is 1: (4-5), and area ratio of effective section of valve seat and cartridge section is 0.09-0.11. Filtering device possesses low breathing resistance and may be used in emergency situations for providing safe evacuation of people during fires in hotels, offices, multistory apartment buildings. EFFECT: increased efficiency, simplified construction and convenient usage. 1 dwg, 4 tbl