If properly coated, and designed along with good insulated glass, aluminum doors can provide strength in high wind applications such as waterfront applications.  PGT Industries makes some nice aluminum door options here in Florida, they know what works in our coastal environment.  Aluminum doors are usually seen in sliding doors, stacking doors, and pocketing doors. Also see Clad Wood doors for wood doors clad with Aluminum, maximizing the strengths of both products.

Applications- high wind areas like bay front, beach front, and high rise applications and patio doors. Most often seen in sliding doors, stacking doors, and pocketing doors.