1" (25mm) Insulating VRE31-4725
1/4" (6mm) UltraClear® with VRE-4725 #2
1/2" (13.2mm) space - argon filled
1/4" (6mm) UltraClear®
Reflected Color
Transmitted Color
Performance Data
Show data as:
Transmittance
Visible Light
50%
Solar Energy
24%
UV
11%
Reflectance
Visible Light-Exterior
27%
Visible Light-Interior
21%
Solar Energy
52%
NFRC U-Value
Winter
0.25 (hr x sqft x °F)
Summer
0.21 (hr x sqft x °F)
Shading Coefficient
0.29
Relative Heat Gain
61Btu/(hr x sqft)
Solar Heat Gain Coefficient (SHGC)
0.25
LSG
2
Viracon's solar and optical performance data is center of glass data based on the National Fenestration Rating Council measurement standards, calculated using Lawrence Berkeley National Laboratory's (LBNL) WINDOW 7 software.
Winter and Summer U-Values are the only performance values available for spandrel glazing. The U-Values for spandrel glazing are the same as the corresponding vision unit. The spandrel color does not impact U-Value.