The DC 3900c Twin vacuum cleaner is a portable but powerful dust extractor suitable for large quantities of dust due to its integrated pre-separator. It is particularly suitable for concrete grinding since 80–90% of the coarse materials are separated in the pre-separator. The remaining dust goes into the filter cyclone. A popular machine since it is powerful enough for most applications yet it can be easily moved and transported. Air flow capacity is suitable for concrete floor grinding machines with diamond discs of up to 500 mm/20” diameter. Plastic dust collection bags charged extra.