Abstract: A system to protect the openings of finished buildings against extreme weather conditions comprising a channel frame, having a channel wherein a weather resistant protective sheet is inserted to protect against hurricanes, tornadoes, typhoons and the like. The system is installed over an opening, which may be a door, a window, a dome, a skylight or any other opening originally designed in the construction of the building or made in a subsequent improvement to the residential or commercial building. The method for assembling the frame and the installation procedure to place it over the opening to be protected is also included.