Products / Sills / ADA Thermal Break SillADA Thermal Break SillThe ADA Thermal Break Sill comes in three different sizes; the 5 Inch, 6 Inch, and 7 Inch.Click the images below to enlarge. ADA Thermal Break 5 5/8″ ADA Thermal Break 6 5/8″ ADA Thermal Break 7 5/8″