Coating installation, in particular as an automatic flat bed machine, for coating components, in particular radiator grills, furniture parts or plastic covers, with a coating agent, in particular with a paint, with a) a coating booth, b) a conveyor for conveying the components to be coated into the coating booth and for conveying the coated components out of the coating booth, b1) wherein the conveyor comprises a movable and at least partially air-permeable conveyor belt, b2) wherein the components to be coated lie on the upper side of the conveyor belt during operation and are fed into the coating booth by the conveyor belt and are discharged from the coating booth, and b3) wherein the conveyor belt forms a filter belt which at least partially allows a downwardly directed air flow in the coating booth to pass through and at least partially retains the coating agent, and c) an application device which is arranged in the coating booth above the conveyor belt and applies the coating agent to the component to be coated, characterized by d) a pressure difference measuring device (16, 17) for measuring a pressure difference (ΔP) between a pressure upstream of the aerated conveyor belt, in particular above the conveyor belt, and a pressure downstream of the aerated conveyor belt, in particular below the conveyor belt, and e) an evaluation unit for calculating a degree of clogging (z) of the conveyor belt with the coating agent retained therein as a function of the measured pressure difference (ΔP). a) a coating booth, b) a conveyor for conveying the components to be coated into the coating booth and for conveying the coated components out of the coating booth, b1) wherein the conveyor comprises a movable and at least partially air-permeable conveyor belt, b2) wherein the components to be coated lie on the upper side of the conveyor belt during operation and are fed into the coating booth by the conveyor belt and are discharged from the coating booth, and b3) wherein the conveyor belt forms a filter belt which at least partially allows a downwardly directed air flow in the coating booth to pass through and at least partially retains the coating agent, and b1) wherein the conveyor comprises a movable and at least partially air-permeable conveyor belt, b2) wherein the components to be coated lie on the upper side of the conveyor belt during operation and are fed into the coating booth by the conveyor belt and are discharged from the coating booth, and b3) wherein the conveyor belt forms a filter belt which at least partially allows a downwardly directed air flow in the coating booth to pass through and at least partially retains the coating agent, and c) an application device which is arranged in the coating booth above the conveyor belt and applies the coating agent to the component to be coated, characterized by d) a pressure difference measuring device (16, 17) for measuring a pressure difference (ΔP) between a pressure upstream of the aerated conveyor belt, in particular above the conveyor belt, and a pressure downstream of the aerated conveyor belt, in particular below the conveyor belt, and e) an evaluation unit for calculating a degree of clogging (z) of the conveyor belt with the coating agent retained therein as a function of the measured pressure difference (ΔP).