WERS Search

Back to Professional Centre

Performance Data as supplied to the Window Energy Rating Scheme (WERS)

Window Performance

The performance values displayed on the following pages are for use in the calculation of Whole of Window (WoW) energy requirements in accordance with the National Construction Code, Volume 1 (section J) & Volume 2 Part 3.12. These values are not to be used for the purpose of glass only energy requirements.

Series Glass Uw SHGCw VTw Glazing Cooling Heating
425 Aluminium Fixed Window
6mm Energy Advantage Low-E		 4.50 0.62 0.71 Single
2
4
425 Aluminium Fixed Window
6mm Eclipse Advantage Clear Low-E		 4.60 0.55 0.58 Single
2
3.5
425 Aluminium Fixed Window
6mm Optigray 23		 6.30 0.38 0.20 Single
2.5
1.5
425 Aluminium Fixed Window
6.38mm ComfortPlus Clear Low E Laminate		 4.40 0.60 0.71 Single
2
4
425 Aluminium Fixed Window
6.38mm ComfortPlus Grey Low E Laminate		 4.40 0.44 0.34 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Sky Blue Laminate		 6.20 0.60 0.46 Single
1.5
2.5
425 Aluminium Fixed Window
6.38mm Cool Blue Laminate		 6.20 0.66 0.64 Single
1
2.5
425 Aluminium Fixed Window
6.38mm Grey Laminate		 6.20 0.54 0.36 Single
1.5
2
425 Aluminium Fixed Window
6.38mm ComfortPlus Neutral Low E Laminate		 4.40 0.45 0.51 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Solect Clear Low E Laminate		 4.40 0.60 0.70 Single
2
4
425 Aluminium Fixed Window
6.38mm Solect Grey Low E Laminate		 4.40 0.39 0.41 Single
3.5
3
425 Aluminium Fixed Window
5mm Green		 6.30 0.57 0.69 Single
1.5
2
425 Aluminium Fixed Window
5mm Grey		 6.30 0.55 0.43 Single
1.5
2
425 Aluminium Fixed Window
6mm Clear		 6.30 0.72 0.76 Single
.5
2.5
425 Aluminium Fixed Window
6mm Eclipse Advantage Arctic Blue Low-E		 4.60 0.33 0.33 Single
3.5
3
425 Aluminium Fixed Window
6mm Eclipse Advantage EverGreen Low-E		 4.60 0.33 0.41 Single
3.5
3
425 Aluminium Fixed Window
6mm EverGreen		 6.30 0.46 0.57 Single
2
2
425 Aluminium Fixed Window
6mm Grey		 6.30 0.51 0.38 Single
2
2
425 Aluminium Fixed Window
6mm Optigray 23		 6.30 0.38 0.20 Single
2.5
1.5
425 Aluminium Fixed Window
6mm Panasap Dark Blue		 6.30 0.52 0.50 Single
2
2
425 Aluminium Fixed Window
6.38mm ComfortPlus Green Low E Laminate		 4.40 0.45 0.61 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Optilight HL129 Low E Laminate		 4.40 0.44 0.34 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Solect Green Low E Laminate		 4.40 0.44 0.61 Single
3
3.5
425 Aluminium Fixed Window
10.38mm Sunergy Clear Low-E Laminate		 4.80 0.48 0.57 Single
2.5
3
425 Aluminium Fixed Window
4mm Energy Advantage Low-E		 4.50 0.63 0.71 Single
2
4
425 Aluminium Fixed Window
4mm Grey		 6.30 0.58 0.48 Single
1.5
2
425 Aluminium Fixed Window
5mm Bronze		 6.30 0.59 0.51 Single
1.5
2
425 Aluminium Fixed Window
6.38mm ComfortPlus Clear Low E Laminate		 4.40 0.60 0.71 Single
2
4
425 Aluminium Fixed Window
6.38mm ComfortPlus Green Low E Laminate		 4.40 0.45 0.61 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Green Laminate		 6.20 0.64 0.62 Single
1
2.5
425 Aluminium Fixed Window
6.38mm Cool Blue Laminate		 6.20 0.66 0.64 Single
1
2.5
425 Aluminium Fixed Window
6mm Sunergy Clear Low-E		 4.90 0.52 0.59 Single
2.5
3.5
425 Aluminium Fixed Window
5mm Clear		 6.30 0.73 0.77 Single
.5
2.5
425 Aluminium Fixed Window
6.38mm ComfortPlus Grey Low E Laminate		 4.40 0.44 0.34 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Clear Laminate		 6.20 0.70 0.77 Single
1
2.5
425 Aluminium Fixed Window
6.38mm Clear Laminate		 6.20 0.70 0.77 Single
1
2.5
425 Aluminium Fixed Window
6.38mm Solect Clear Low E Laminate		 4.40 0.60 0.70 Single
2
4
425 Aluminium Fixed Window
6.38mm Solect Green Low E Laminate		 4.40 0.44 0.61 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Green Laminate		 6.20 0.64 0.62 Single
1
2.5
425 Aluminium Fixed Window
6.38mm Solarplus TS30 Clear Laminate		 6.20 0.36 0.29 Single
2.5
1.5
425 Aluminium Fixed Window
4mm Green		 6.30 0.59 0.70 Single
1.5
2
425 Aluminium Fixed Window
5mm Dark Grey		 6.30 0.50 0.19 Single
2
2
425 Aluminium Fixed Window
6mm Bronze		 6.30 0.55 0.44 Single
1.5
2
425 Aluminium Fixed Window
6mm Eclipse Advantage Blue-Green Low-E		 4.60 0.40 0.49 Single
3
3
425 Aluminium Fixed Window
6.38mm EverGreen Laminate		 6.20 0.44 0.55 Single
2.5
2
425 Aluminium Fixed Window
6.38mm Sunergy Clear Low-E Laminate		 4.80 0.51 0.58 Single
2.5
3.5
425 Aluminium Fixed Window
4mm Clear		 6.30 0.74 0.77 Single
.5
2.5
425 Aluminium Fixed Window
5mm EverGreen		 6.30 0.51 0.63 Single
2
2
425 Aluminium Fixed Window
6mm Eclipse Advantage Grey Low-E		 4.60 0.37 0.28 Single
3.5
3
425 Aluminium Fixed Window
6.38mm EverGreen Laminate		 6.20 0.44 0.55 Single
2.5
2
425 Aluminium Fixed Window
6.38mm Grey Laminate		 6.20 0.54 0.36 Single
1.5
2
425 Aluminium Fixed Window
6mm Arctic Blue		 6.30 0.46 0.45 Single
2
2
425 Aluminium Fixed Window
6mm Azuria		 6.30 0.45 0.59 Single
2
1.5
425 Aluminium Fixed Window
6mm Green		 6.30 0.54 0.67 Single
1.5
2
425 Aluminium Fixed Window
6.38mm ComfortPlus Neutral Low E Laminate		 4.40 0.45 0.51 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Optilight HL129 Low E Laminate		 4.40 0.44 0.34 Single
3
3.5
425 Aluminium Fixed Window
6.38mm Solect Grey Low E Laminate		 4.40 0.39 0.41 Single
3.5
3
425 Aluminium Fixed Window
6.38mm Sky Blue Laminate		 6.20 0.60 0.46 Single
1.5
2.5
425 Aluminium Fixed Window
6.38mm Solarplus TS30 Clear Laminate		 6.20 0.36 0.29 Single
2.5
1.5

Search Again…

  1. U Value

  2. SHGCw (Solar Heat Gain Coefficient)

  5. Glass Type

    Keyword search through the glass descriptions. Enter a keyword for product or colour such as "eclipse".

  6. Single/Double Glazing

For more information, please contact your G.James representative or use our Professional Support Page.