The DC 2900 is our most popular dust extractor. It is suitable for vacuum cleaning and source extraction from handheld power tools (with up to 5” suction casings) and small table saws. The DC 2900 has a sturdy steel chassis with big wheels but is still lightweight and portable. DC 2900 c AutoStart: Connect the subject electric tool to the electrical outlet on unit. Set the selector switch to the AUTO position. The unit will start automatically when the subject tool is started.