ADQ supply and exhaust diffuser for ceiling instalation. The diffuser can be used in offices, shops or similar premises, up to 4 m room height. The diffuser is connected to plenum box with screw through the centre of the front face. ADQ is manufactured from anodized aluminium with satin finish and is available in the following sizes: 250x250, 300x300, 400x400, 500x500, 600x600, 625x625. The diffuser can be RAL painted as an optional extra. This device can be used for exhaust air and is installed into a plenum box with a screw in a front face.