Lift & Slide custom door systems are a popular choice for opening up large expanses. A system of levers and wheels lifts the panel off the sill enabling movement of large, heavy panels with very little effort. A door weighing up to 880 pounds can be opened with ease. Levers and wheels lift the panels off the sill, freeing it from weather stripping with very little effort Sill-supported panels run on two multi-wheel carriages Resistant to air and water infiltration. There are dual weather seals at the top, bottom and sides.