Ceiling Diffuser BK-100M Description: 1.All-steel construction 2.Adjustable straight fins provides individual deflection control 3.Stamped face margins eliminate mitered corners and rough edges 4.Used for return air, exhaust air or natural ventilation application 5.Standard sizes: 4"*8", 4"*10", 4"*12", 4"*14", 6"*6", 6"*8", 6"*10", 6"*12", 6"*14", 8"*8", 8"*10", 8"*12', 8"*14", 10"*10", 12"*12", 14"*14" (inch). 7.Standard color: natural anodize or powder coated white. OEM and ODM orders are welcome.