Abstract: In order to manage with a lower suction capacity of the sawdust fan in the case of a vertical board saw with a sawing unit movable horizontally and vertically, a support grid receiving a workpiece, being arranged essentially vertically and displaceable in the vertical direction, this grid comprising a plurality of support bars arranged horizontally and in parallel spaced relation to one another as well as suction channels arranged at right angles hereto and opening towards the workpiece, and a device for collecting the sawdust resulting on the side of the support grid during horizontal cutting, it is suggested that the support bars be designed as essentially closed channels each with a slot-shaped opening extending essentially along the entire length of the support bar, an edge of the saw blade of the sawing unit being able to enter this opening essentially without making contact during the horizontal cutting, and that the support bar channels be connected to a sawdust collecting means, wherein the support ba