The EMCO 300 Storm Door is not pre-hung but features an improved installation system since it comes with pre-cut latch and hinge side z-bars to eliminate trick measuring & sawing, bottom mount installation with self-leveling alignment clips to enable accurate placement in rough opening, and universal handing design that allows for either a right or left handed installation. Moreover, the advertised timeframe of 2-Hour Easy Install is tested and is based on time-study conducted from different people and skill set. Some outside factors can affect the success of the installation. We are sorry for the inconvenience this caused you. - Charmaine