... Time30-45daysAluminium 4 way ceiling air diffuser1) Constructed from aluminum /PVC2) Four-way frame 3) Removable core for ... and public commercial building etc.Customized sizes are also available upon request.Standard sizes: 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, ... ,Air Diffuser,air louver,Diffusers Features:1) Constructed from aluminum, finished in white enamel2) Four-way frame3) Removable ...