The 900 series sliding patio door, which includes an XO, OXO, and picture window, is available for both the new construction and replacement markets. This product features 7/8” IG with up to a 1” IG option. The 4-3/4” frame system has full perimeter, heavy-duty weatherstripping and a deep-pocket integral interlock which provides extra protection against air infiltration and enhances the energy efficiency. The sash is SDL bar compatible. It was designed to meet AAMA DP50 specifications.