The best laser engraving and cutting results are achieved by focusing the extraction specifically on the point of the laser processing. This can be done 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, such as engraving laminate boards, so they lie flat on the work table. By doing this you achieve a uniform distance between the lens and workpiece, resulting in a homogeneous processing of the surface.
To cover the rear exhaust vents, we recommend using magnetic strips or masking tape. For the table, materials such as paper, cardboard or laminate boards are sufficient as cover.