Vent sill rail extrusion
FIG. 1 is a fragmentary top perspective view of the vent sill rail extrusion showing my new design; 
     FIG. 2 is a left elevational view thereof broken away to indicate indeterminate length; 
     FIG. 3 is a right elevational view thereof broken away to indicate indeterminate length; and 
     FIG. 4 is a front elevational view to a reduced scale in which the rear elevational view is a mirror image of the front view.