Application: Slot diffuser in a plate (LDP-13/L) is suitable for air-conditioning of roms with suspended ceiling heights of 2,6 to 4 m and 10K temperature difference between supply and rooom air. It is basically used for air supply, but it can be used also as air exhaust diffuser. Advantages: Integrated light permits new possibilities of modern design of ceilings. By combining two elements (diffuser and light in one unit) costs are lower, because only one ceiling opppening is required. Exhaust air leads away the heat generated by the light. Please send me more information.