Dust Collector Dust Extractor for Woodworking Machine There are two types of dust collector, two bags and four bags. Generally speaking, 2.2 kw dust collector has two bags; while 3.0kw dust collector has four bags. A complete dust collecting system is consisted by following parts 1) Dust collector for woodworking cnc router 2) Dust collection hood 3) Dust pipe 4) Pipe bracket