... 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 ... from aluminum, finished in white powder coated.2.4-way diffuser.3.Foam gasket is sealed around the back of the ...