1)Cooling system individual independence 2)vacuum water,acud,oil,alkali 3)Dust collection of up to 99.8% Features:Cooling system individual independence, can be used continuously for a ling time, can be vacuum water, acide, oil, alkali, corrosion resistance, resistance to impact, the filtering area of 3600 square meters, dust collection of up to 99.8%, applicable to all types of large workshop, ...