... 3. good quality Detailed Product Descriptionsquare aluminium diffuser, air diffuser, aluminum diffuser, air grille,ventilation, HVAC 1.Mannual closing ... . 2.Material Extrude Product Name:square aluminium diffuser, air diffuser, aluminum diffuser, air grille,ventilation, HVACMaterial: AluminumCorlor:white ... finished in white powder coated.2.4-way diffuser.3.Foam gasket is sealed around the back ...