Uxcell Square Ceiling Diffuser, Aluminum Vent Cover for HVAC System 13 x 13 Inch

External Size: 450 x 450mm/17.7 x 17.7 Inch(L*W) Neck Size: 325 x 325mm/12.8 x 12.8 Inch(L*W) for 13 x 13 Inch ventilation duct or canal Duct Opening Size: 400 x 400mm/16 x 16 Inch(L*W) Height: 55mm/0.2 Inch Color: White Packing List: 1 Pcs x Air Supply Diffuser