Name: air diffuser, square diffuser, ceiling diffuser, 4 way air diffuser Material: high quality aluminum Features: 1. clean lines with no unsightly visible screws 2. with removable core 3. available with optional opposed blade damper 4. white powder coated finish standard color: RAL9010. RAL9016 5. other color are available. Such as anodized finish 6. sizes according to client's need Model Neck Size (HxL mm) 150X150 225X225 CD-A 300X300 375X375 450X450 525X525 600X600
http://www.air-louvers.com/square-ceiling-diffuser/