| Banded spiral around the electric heating radiant tube, the structure is basically the same as the first kind of structure of the heater, just heating element USES belt winding resistance, resistance to take general thickness of 1-3 mm, width of 10-20 mm, tube core also many for multiple groups type tube core, under the same surface load, large heat radiating surface, can save material, general power point heat radiant tube using this form.
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