Fusion-welded sash and mainframe with multi-wall extrusion design for superior welding strength

Metal reinforcement at meeting rails

Beveled exterior mainframe

Narrowline sash for optimum glass area

Double-barrier weatherstripping at all sash points

Theft deterrent blocks 

Nylon-encased metal dual roller system 

Color-coordinated cam lock and keeper

Insulated glass unit with optimal air space for year-round performance

Interlock at sash meeting rails

Single operating sash