... heat exchange 2.energy saving, noiseless,not dry 3.far infrared,more healthy and comfortable 1.Application area: carbon crystal wall ... .2.Work Theory (1). Carbon crystal is the main heating element and its electric conversion rate can reach to 98% high ... , temperature limited(4).no pollution, noiseless,not dry(5).far infrared, more healthy and comfortable(6).good looking pictures: design any ...