DEVICE FOR PROTECTING RESPIRATORY ORGANS FROM REDUCED TEMPERATURES Russian patent published in 2001 - IPC

FIELD: equipment for protecting individual's face and respiratory organs from cold. SUBSTANCE: device has casing with inhalation and expiration openings, expired air channel and inspired air channel which are separated by heat transfer wall and arranged so that casing is defined by expired air channel outer wall. Both channels are provided with return valves. Length and area of channel sections are selected so as to provide maximum heat transfer between channels through heat transfer wall. EFFECT: simplified and reliable construction, reduced manufacture costs and provision for effective utilization of heat energy of expired air. 5 cl, 1 dwg