Vintage Technologies WD20 RV Teardrop, Cargo, Horse Trailer, Window (1) 12" x 24" Vertical Vented Configuration: Vertical half vent with a screen and window lock, Includes stainless steel mounting screws Cut Out 12-1/4 x 24-1/4 Outside Measurement 13-1/4 wide x 25-1/4 tall Corner Radius 3-5/16