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1" (25mm) Insulating VP35-18

1" (25mm) Insulating VP35-18

1/4" (6mm) Pure Mid Iron with VP-18 #2
1/2" (13.2mm) space - air filled
1/4" (6mm) Pure Mid Iron

Reflected Color
Transmitted Color

Performance Data

Show data as:

Transmittance

Visible Light
18%
Solar Energy
16%
UV
17%

Reflectance

Visible Light-Exterior
25%
Visible Light-Interior
43%
Solar Energy
23%

NRFC U-Value

Winter
0.43 (hr x sqft x °F)
Summer
0.44 (hr x sqft x °F)
Shading Coefficient
0.29
Relative Heat Gain
64Btu/(hr x sqft)
Solar Heat Gain Coefficient (SHGC)
0.25
LSG
0.72

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.