... , and with good uniformity. 4. Environmental protection, this is airtight system, and dust almostly not excape, rust environment ... and can be recycle. 7. The one-time investment is small, only about 30% -40% of the traditional methods. Tower inner wall ... play both the good results of the sealed, the seals with good durability.Also taking into account the interior parts of a high degree of disorder, to ...