The Ultra 5000 single-hung has multi-chambered construction and fusion welded corners. The lower sash opens for ventilation but the upper sash is stationary.  The meeting rails and handle rail is reinforced with metal for rigidity.  A full interlock at the meeting rail and a stepped frame design provides additional strength to the window. 

Ultra window units contain 3/4" insulated glass made with a Warm Edge insulating system. Finned weatherstripping helps control air infiltration.  A groove around the master frame allows simple stacking and mulling of multiple units and the easy application of supplemental profiles. The Ultra 5000 is available with or without an integral nailing fin.