1.Compatible with any printing machine2.Concurrent dust collecting from up and down or only from down 3.Automatic manual shifting easy operation and non-maintenance 4.Frequency changer adjusts attraction according go the thickness of paper 5.Automatic program control, easy operation and non-maintenance. 6.New fashioned filtering net with no impact on attraction. 7.Dust automatically collected in transparent tank, clear at a glance. 8.No impact on the air-conditioning of workshop, better working environment. 9.Less dust dropping, longer operation life, better printing quality. 10.Less damage to gear chain and electronic circuit duct dust collector and ductless dust-collector for option.