Extrusion shall be 6063 aluminum in T5 and T6 temper., with walls of from .084” to .125” nominal thickness at all structural locations. Frame jamb shall be tubular shaped. Head, jamb and sill shall have a dimension of 1-3/4”x 4-1/2”. Frame shall be assembled by securing head and sill to jambs using eight concealed sheet metal screws. Panels shall be assembled using a 5/16” diameter, continuously threaded steel rod, running through top and bottom rail from stile to stile. Each rod end shall be held firmly with washered hex nuts. Sill shall have an overall height of 2-1/8”and contain a 1-1/4”step for panel rail to seat. Exterior face of rail shall finish flush with outside edge of sill. Door shall be exterior swing, providing the best possible protection against water infiltration. Frame head shall contain integral hood projecting out from header to deflect clinging water from running directly down head and into opening at top of panel.