... other corrosives.These ventilators are suitable for ventilation of all kinds of tanks in the naval and merchant ships.They ... Kyokai(NK),the United Kingdom Lloyd’s Register (LR),American Bureau of Shipping(ABS),Det Norske Veritas(DNV),Bureau Veritas(BV), ... With high efficiency,low noise,smooth running characteristics of a wise range of ventlation of ships,including explosion-proof fans for containing ...