The air duct type electric heater is mainly used for air heating in the air duct. The specifications are divided into three types: low temperature, medium temperature and high temperature. The junction box is equipped with an over temperature control device. In addition to the control, in addition to the over-temperature protection, an intermodal device is installed between the fan and the heater to ensure that the electric heater must be started after the fan is started, and a differential pressure device is added before and after the heater to prevent the fan from being blown. Fault, the gas pressure of the channel heater should not exceed 0.3Kg/cm2. If it is necessary to exceed the above pressure, please use the circulating electric heater; the low temperature heater gas heating maximum temperature does not exceed 160 °C; the medium temperature type does not exceed 260 °C; high temperature type does not exceed 500 °C.
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