... : 40*10, 50*15, 45*20.,etc 3, Thickness: Aluminum grid ceiling~~1), Material: Aluminum 1xxx, 3xxx, 5xxx2), Specification(mm): ,size: 75*75 ... installation.Welcome to contact us. Open cell ceiling Product:Open cell Ceiling / GrillesMaterial:high quality Aluminum alloySize:10*40, 15*50mm,20*45mm ... ,meeting room,supermarket,school,corridor,toilet,hospital,re-decoration works. Aluminum grid ceiling