FIELD: air temperature increasing with the purpose of accommodation heating and in drying processes. SUBSTANCE: air-heater has ceiling- mounted radiation heat exchanger located in fuel combustion chamber, which transforms into vertical after-combustion chamber. Fire area of chambers has double-walled construction. Final heating of blow-down air preheated in radiation heat exchanger takes place into gap between chamber walls. Heated air is mixed with hot combustion gases fed through recirculation system by smoke exhauster. Air heater has regulation system for outgoing combustion gases extraction and supply system for supplying of liquid low-grade organic fuel used for illumination during combustion process. Air heater further comprises removable fire-grates, system for regulation of blow-down air head and for stabilizing of blow- down air blasting regime which regulates blowing fan operation. Tubular convection heater section is installed at after-combustion chamber outlet. Additional blow-down windows are formed in after-combustion chamber walls. EFFECT: increased effectiveness. 2 cl, 2 dwg
