New Construction, 400 Series Features:

• Contoured frame design with integral nailing fin.
• Dual-paned glass unit can be ordered with optional Low E glass and an Argon gas fill to maximize energy efficiency.
• Insulating glass unit is set ½'' into the sash to keep edges warmer.
• Frames and sash, welded at the corners, create strong, effective units.
• Weatherseals placed at key points around each sash increase weather performance by reducing air flow.
• The U-channel spacer system is more efficient than conventional box spacers — raising interior glass surface temperature by reducing conduction rates.
• Contoured grids are located inside the insulating glass unit for a smooth, easy-to-clean surface.
• Available with wood or Quick Trim™ cellular pvc jamb extensions — choose
  either 4-9/16" or 6-9/16" construction — for quicker installation.
• Comprehensive warranty.