1" (25 mm) Glazing Infills
- Series 451 - 2" x 4-1/2" (50.8 x 114.3 mm) Non-Thermal
- Series IT451 - 2" x 4-1/2" (50.8 x 114.3 mm) Thermal
- Screw Spline or Shear Block Assembly
- Stacking Installation Option
Series IT451 offers improved thermal performance using the Poly-Aluminizer™ and Lancer™ Thermal Break Technology. Series 451 and IT451 may be interior or exterior glazed. A top load E.P.D.M. gasket is used to position and weatherseal the glass in the aluminum pocket. Center Glazed Systems are compatible with all U.S. Aluminum Entrance Doors.