• A fusion-welded sash and mainframe structure for added strength and rigidity.
• Tough, extra-thick extrusion walls provide the ultimate in welding strength.
• Multi-wall extrusion for superior welding strength.
• Interlock at sash meeting rails create a super-tight seal against air infiltration, providing security, comfort and well being.
• Sloped sill helps water drain to the exterior.
• Drop-in glazing provides energy efficiency as well as interior aesthetic appeal.
• Triple-barrier weatherstripping for superior protection from air and water infiltration.
• A constant force balance system that eliminates sash cords, weights and pulleys and provides easy fingertip operation.
• Hidden screen track produces clean lines and added beauty.

Plus These Additional Features:

• Dual locks on all windows over 25" wide.
• Dual ventilator locks, a secure way to keep windows open for ventilation.
• Full balance covers help protect against air infiltration while adding a finished look to the window frame.
• Tilt-in top and bottom sashes make cleaning safe and easy from inside the home.
• Full or half fiberglass screens provide ventilation while keeping insects out.