The window assembly 1, wherein at least one of {TAIL ~ said upper and lower horizontal members} includes {HEAD ~ an extended flange}, said extended flange extending either above or below said sliding pane and between said fixed panes 
The window assembly 1 , wherein at least one of { TAIL ~ said upper and lower horizontal members } includes { HEAD ~ an extended flange } , said extended flange extending either above or below said sliding pane and between said fixed panes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH