Grinding installation with - a roller press for comminuting brittle grinding stock, which comprises two counter-rotating grinding rollers, - a static classifier with a classifying stock inlet for fresh grinding stock and/or grinding stock comminuted in the roller press, an aeration plate which is arranged at an angle to the horizontal and through which classifying gas flows, a first outlet, for oversized material, which is connected to the roller press and an outlet for fine material, and - with a conveying mechanism which is connected to the roller press and the classifying stock inlet of the classifier in order to raise the fresh grinding stock and/or grinding stock comminuted in the roller press, characterized in that - the roller press, the conveying mechanism and the classifier are arranged one next to the other in terms of construction and in a straight line one behind the other in terms of the material flow direction, - the classifying stock inlet is arranged on that side of the classifier which is oriented toward the conveying mechanism, - the classifier has a classifying gas inlet for the classifying gas, which is connected on the classifier in a region which is oriented away from the conveying mechanism, - wherein the classifier further has two classifying spaces (16, 17) which are arranged one above the other and are separated from one another by the aeration plate, - wherein the classifying stock inlet for the fresh grinding stock and/or the grinding stock comminuted in the roller press opens into the upper classifying space and the classifying gas inlet is connected to the lower classifying space, - and wherein the first outlet for oversized material is connected to the upper classifying space and the lower classifying space is provided with a second outlet for oversized material. - a roller press for comminuting brittle grinding stock, which comprises two counter-rotating grinding rollers, - a static classifier with a classifying stock inlet for fresh grinding stock and/or grinding stock comminuted in the roller press, an aeration plate which is arranged at an angle to the horizontal and through which classifying gas flows, a first outlet, for oversized material, which is connected to the roller press and an outlet for fine material, and - with a conveying mechanism which is connected to the roller press and the classifying stock inlet of the classifier in order to raise the fresh grinding stock and/or grinding stock comminuted in the roller press, - the roller press, the conveying mechanism and the classifier are arranged one next to the other in terms of construction and in a straight line one behind the other in terms of the material flow direction, - the classifying stock inlet is arranged on that side of the classifier which is oriented toward the conveying mechanism, - the classifier has a classifying gas inlet for the classifying gas, which is connected on the classifier in a region which is oriented away from the conveying mechanism, - wherein the classifier further has two classifying spaces (16, 17) which are arranged one above the other and are separated from one another by the aeration plate, - wherein the classifying stock inlet for the fresh grinding stock and/or the grinding stock comminuted in the roller press opens into the upper classifying space and the classifying gas inlet is connected to the lower classifying space, - and wherein the first outlet for oversized material is connected to the upper classifying space and the lower classifying space is provided with a second outlet for oversized material.