The difference between three methods of air duct heater:

In addition to over-temperature protection in the operation, inter-transport equipment is also installed between the fan and the heater to ensure that the electric heater starts. After the fan is started, a differential pressure device is added before and after the heater to prevent fan problems ; The low-temperature type can be directly installed on the air duct, while the medium-temperature type and high-temperature type have 100mm thick insulation material between the outer wall of the channel and the heater junction box because of the difference in structure. The internal temperature, the pressure of the gas heated by the channel heater should generally not exceed 0.3Kg / cm2, if you need to exceed the above pressure, please select the circulation type electric heater; the low temperature heater gas heating high temperature does not exceed 160 ℃; the medium temperature type does not Exceed 260 ℃; high-temperature type does not exceed 500 ℃.