For the vulnerable drink (requirements on bacterium ratio), Vaero designed the high-efficiency air conveyor. It enhance the filtration efficiency by setting a high-efficiency filter over the standard-efficiency filter at the fan entry, and put the PET plate cover on both sides of the conveyors, which prevents blowing the ambient air into the bottles.  High-efficiency filtration make it possible to change some hot-filling into cheap aseptic “cool-filling”.