... centrifugal ventilators or simply the ventilator is capable of blowing air, ocean air containing salt vapour, ... vane wheel, being riveting structure is made of aluminum alloy and carefully balanced by static ... been CSS certified by the Anti-Explosion Examining Centers of ABS, BV, DNV, GL, KR, LR, NK, ... group for designing and manufacturing, and is composed of one professor (part-time), 4 senior engineers ...