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Glazing Performance Comparison

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1" Clear + Energy Select 63 (3) Clear

Outboard: 1⁄4" Clear
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Energy Select 63 on Clear (#3 Surface)

1" Energy Select 40 (2) Clear + Clear

Outboard: 1⁄4" Energy Select 40 on Clear (#2 Surface)
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Clear

1" Energy Select 36 (2) Clear + Clear

Outboard: 1⁄4" Energy Select 36 on Clear (#2 Surface)
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Clear

1" Energy Select R42 (2) Clear + Clear

Outboard: 1⁄4" Energy Select R42 on Clear (#2 Surface)
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Clear

1" Energy Select 28 (2) Clear + Clear

Outboard: 1⁄4" Energy Select 28 on Clear (#2 Surface)
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Clear

1" Energy Select 25 (2) Meadow Green + Clear

Outboard: 1⁄4" Energy Select 25 Meadow Green (#2 Surface)
Gap: 1⁄2" Spacer
Inboard: 1⁄4" Clear

VLT % UV % TSE % R Vis
Out %
R Vis
In %
R Out
TSE %
U-Value Winter U-Value SummerU-Value EuroRHGSHGC SC LSG
1" Clear + Energy Select 63 (3) Clear
7631471212220.300.291.721290.540.631.40
1" Energy Select 40 (2) Clear + Clear
6916331213310.290.271.65920.390.441.80
1" Energy Select 36 (2) Clear + Clear
6313301216300.290.271.66860.360.411.76
1" Energy Select R42 (2) Clear + Clear
6221362622330.300.281.681000.420.481.47
1" Energy Select 28 (2) Clear + Clear
6012241315380.290.271.63690.280.332.12
1" Energy Select 25 (2) Meadow Green + Clear
51520101580.290.271.66670.270.321.87

Note: Performance data calculations in this table are based on the International Glazing Database (IGDB) Version 28.0. Learn more about IGDB.

* Some glass types in this table may not be stocked. Contact ITI Glass for availablity.

  • VLT % - Visible Light Transmittance
  • UV % - Ultra-Violet Transmittance
  • TSE % - Total Solar Energy Transmittance
  • R Vis Out % - Reflected Visible -- Exterior
  • R Vis In % - Reflected Visible Light -- Interior
  • R Out TSE % - Total Solar Energy Reflectance -- Exterior
  • U-Value Winter, Summer - Btu/(hr x sqft x F)
  • U-Value Euro - European U-Value
  • RHG - Relative Heat Gain, Btu/(hr x sqft)
  • SHGC - Solar Heat Gain Coefficient
  • SC - Shading Coefficient
  • LSG - Light to Solar Gain