Dry exhaust dust CNC plasma cutting mainly uses an air duct and a sliding suction outlet, suction outlet of the mobile can rely on the door frame running gear then move, in the air duct of the top surface of the sealed strips rely on fan discharge high-pressure air negative adsorption pressure to seal strips seal the duct to play the role. The greatest advantage of the way kind of dust to dust removal equipment is not on top of the door frame, greatly reducing the load of the door frame to walk, but also due to fan vibration to avoid the impact of cutting quality. Whether this way of dust or dust effects are on the cutting quality on the market for the best way of plasma dust.