FIELD: treatment of fibers of bast crops, such as hemp, kenaf, jute. SUBSTANCE: method involves applying single layer of film to prefabricated wooden carcass during summer. To increase stop time of fire box, fresh air is supplied through furnace ash pit in minimum amounts so that natural ventilation exchange is provided. In case there are complications in fabrication of chimneys, two parallel chimneys may be made instead of one wide chimney. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 dwg
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