WARM-AIR HEATER

PROBLEM TO BE SOLVED: To resolve a problem in a conventional warm-air heater that hot air, heated to a high temperature on the surface of a combustion tube 4, flows to the central part of a propeller fan 6 by the flow of air B flowing from a point of about 1/2 of the radius R of the propeller fan 6 to the inner peripheral side of the same from the fore part toward the rear part of the same whereby a temperature at the central part of the fan 6 is raised and, accordingly, a motor 7 for driving the ventilating propeller fan 6 is heated through a rotary shaft 7a and the temperature of the same is raised whereby lubricating oil in the driving motor 7 is dried up and the motor 7 is locked thereby becoming impossible to develop the original function of the heater. SOLUTION: In order to resolve the problem, the warm air heater comprises the ventilating propeller fan 6 arranged on the rear surface of the heater and the combustion tube 4 and a warm air diffuser arranged in front of the fan. A heat shielding plate 14, forming a double wall structure together with the tube 4 is provided between the propeller fan 6 and the combustion tube 4 at the rear surface side of the combustion tube 4 to reduce the temperature of the central part of the ventilating propeller fan 6.