The window has slotted drain holes and a 3/4" flange around the entire window with pre-drilled holes for mounting. You’ll also enjoy cabinet-style hinges that allow the window to swing up, a magnet mounted on the frame to secure to the wall when open, and two swivel clips to fasten it closed. The window is made from aluminum with weather stripping on the window and in the main frame. Two screen clips mounted on the bottom secure the window in place when not in use, and you can easily open and close it with virtually no noise. Once installed, the window has a 2 1/4" clearance. (In order for the window to fully open your wall thickness must be 2" or less) For this window we recommend cutting your rough opening 1/8" bigger on the length and width. EX: 24 x 11 1/2 window would go in a 24 1/8 x 11 5/8 RO. For help with installation please go to our installation instructions found on our website. These can also be custom built. Send us an email for more info on custom builds.