Replacement of a old slider that had seal failure between glass which results in fogging up between glass. This unit has a added feature of blinds between the glass. On newer units (10 to 20yrs old, select brands) I replace slider panels and window sanches that have delamanation peeling or cladding failure on exterior or seal failure. Sometimes panels & sach materials may be covered by manufacturer if within warranty period. Call me today for install or consult.