Thermal Specifications: 4500T Series Patio Door

4500T Series Picture Window with Air Gap and Aluminum Spacer
Exterior Glass Interior Glass U-Factor
(Btu/h-ft²-°F) 		SHGC VT
4mm Clear 4mm Clear 0.60 0.64 0.69
5mm Clear 5mm Clear 0.60 0.62 0.68
4mm Clear 6mm Laminated (PVB 0.8mm) 0.60 0.63 0.69
4mm Guardian RLE 70/36 (#2) 4mm Clear 0.46 0.32 0.59
6mm Guardian SN68 (#2) 4mm Clear 0.46 0.33 0.58



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