The invention concerns a drawing room with an operator's space enclosed by a first perforated wall (10) and a second perforated wall (8). The drawing room is connected to a device (3) to generate an air flow through the first and other perforated walls (10). The perforations over most of the perforated walls (10) cover a first perforation area per wall area. The perforations over one zone of the perforated walls (8,10) cover a second perforation area per wall area;where the second perforator per wall area is higher than the first. This may compensate for the fact that objects in the operator's compartment locally restrict air movement.In an execution form, the distribution of the average perforation area per wall area on the first and other perforated walls (8,10) essentially consistent with each other; the zone where the perforations cover a second average perforation area per wall area is appropriately arranged where an item in the operator's compartment is most often arranged and the item may typically be an operator; the perforations may also cover several zones; in an additional execution form, it covers: perforations along one edge of the perforated walls (10) a third average perforation area per wall area, where the third average perforation area per wall area is higher than the first.
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