Application Air supply or air return in Air-conditioning, Ventilating and Heating systems Mounting Overlapped in sidewall or in false ceiling by means of hidden fixing systems Implementation Extruded Aluminium construction. Frame with flat frontal face and inner netting grille of 13 mm x 13 mm made of Aluminium. Provides maximum air flow and very low noise level as the grille's free area is >90% of the nominal area. Standard Sizes Available in all standard sizes up to 1200 x 600 mm. Standard Finishes Natural Aluminium, Anodized or Powder coated in standard RAL white colours