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Winding heater is mainly used for the air duct heating, the specification is divided into low temperature, temperature, and high temperature three forms, in the structure in common is USES the steel plate support electric heat pipe to reduce the vibration of the electric heating tube, in the junction box are equipped with super temperature control device. In addition to the other in control with overtemperature protection outside, still in the fan and heater between the multimodal transport device, to ensure the electric heater starting must be in fan starting later, in heater and add a differential pressure device, in case fan fault, channel heater heating gas pressure generally should not be more than 0.3 Kg/cm2, if you need more than above pressure, please choose circulating electric heater; Low temperature type heater gas heating the highest temperature not to exceed 160; Medium temperature type does not exceed 260; High temperature type of no more than 500. Air duct type electric heater for industrial air duct, air conditioning duct and various industries air through the air heating, improve the output air temperature, generally in the air duct transverse open insert. According to the air duct work temperature points in low temperature, high temperature mild, According to the air duct in wind speed points in low wind speed, wind speed and high wind speed. Wind heater for industrial air duct, air conditioning duct and various industries air through the air heating, improve the output air temperature, generally in the air duct transverse open insert. According to the air duct work temperature points in low temperature, high temperature mild, According to the air duct in wind speed points in low wind speed, wind speed and high wind speed.