You get the best engraving and cutting results if you focus the extraction specifically on the point of the laser machining. You can do this by covering the unused part of the rear exhaust vent.
If you use a vacuum table, you should also cover the vacant suction holes. This results in better suction for thin workpieces (e.g. laminate boards) so they lie flat on the work table. Thus, you achieve a uniform distance between the lens and workpiece, resulting in a homogeneous processing of the machined surface.
To cover the rear exhaust vents, we recommend using magnetic strips or masking tape. For the table, a cover with paper, cardboard or laminate boards is sufficient.