18 X 8 (Duct Opening Size) Air Register 2 Way Stamped Steel with Damper (Color-White) Stamped Face 2 Way Fixed Vane 18x8 Stylish 2 way register for wall supply air. Steel construction. Vanes are fixed. Manual shutter damper opens and closes with lever. Color-White. Comes with mounting screws. Fits 18" x 8" opening. Register face is 19-3/4" x 9-3/4".