What are “French” paned windows?
Colonial style windows consisting of small square sections of glass divided by bars. Such bars placed on a window are known as ‘grilles’. The four types of “French” paned windows are as follows: truely divided lite (TDL) windows, simulated divided lite (SDL) windows, windows with airspace grilles, and windows with perimeter grilles. The following section lists their differences: TDL: A window with truly separated panes of glass. These panes are held together by sash bars. SDL: A window with one pane of glass that is superficially separated, or covered, by a permanent grille both sides. Airspace: Windows with the grille sealed in between two panes of glass (in the airspace).This type of “French” paned window is the easiest to clean because there is no grille on the outside surfaces of the panes. Perimeter: A window with a snap-on grille.
