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Other  heat tracing forms and methods
Groundsill heat tracing 
While low-pressure air is below 0℃, although the groundsill of the pots or containers have been heat-insulated, extreme temperature  can lead to the bellowing cadre of the ground, and then the ground structure will be frozen. We usually put the  heating cable into the net tube, which is under the insulation,to  keep the temperature of the hardpan layer at around 5 centigrade degree.
By the heating cable heating the groundsill , the freeze room and storage room also can keep warm; so as to avoid ground structures freeze for  extreme temperature. 

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