... more than 14years. CE,CCC,ISO certificate Life:15years glass vacuum tube Working all the year round regardless of the weather.Manufacturer ... graceful appearance long service life and non pollution3,the evacuated tube with superconductive heat pipe is the most advanced product ... 1500mm,dia,47*1500mmdia,58*1800mm,70*2000mm5,High resistance to the wind ,hail and severe temperature6,High efficiency of ...