PURPOSE: A thermal conduction device for a hot blast heater or a cold blast heater is provided to discharge the air in a heat conduction unit and to maximize hot air or cold air generation efficiency. CONSTITUTION: A thermal conduction device for a hot blast heater or a cold blast heater comprises a heat conduction case, one or more heat conduction units(20), a fan case(30) and a fan(40). The heat conduction unit is installed inside the heat conduction case. The fan is located in the fan case and supplies the air to the heat conduction unit. An assistant plate is inserted between the heat conducting plates.
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