WINDOW ENERGY RATING (WER)
	OPTIONS
	Glass Leaf 1 (Outside)	Spacer Type	Cavity	Glass Leaf 2 (Inside)	U-Value	G-Value
	4mm Tgh/Ann. Clear	Aluminium	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	66.00
	4mm Tgh/Ann. Clear	Thermix TXN	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	66.00
	4mm Tgh/Ann. Clear	Swiss Spacer V	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	66.00
	4mm Tgh/Ann. Clear	Aluminium	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	66.00
	4mm Tgh/Ann. Clear	Thermix TXN	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	66.00
	4mm Tgh/Ann. Clear	Swiss Spacer V	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	66.00
	4mm Tgh/Ann. Low Iron	Aluminium	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	71.00
	4mm Tgh/Ann. Low Iron	Thermix TXN	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	71.00
	4mm Tgh/Ann. Low Iron	Swiss Spacer V	16mm (90% Argon)	4mm Tgh/Ann UltraN	1.10	71.00
	4mm Tgh/Ann. Low Iron	Aluminium	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	71.00
	4mm Tgh/Ann. Low Iron	Thermix TXN	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	71.00
	4mm Tgh/Ann. Low Iron	Swiss Spacer V	16mm (90% Argon)	4mm Tgh/Ann Planitherm Total	1.20	71.00
	The calculations for Window Energy Ratings are only based on the above Double Glazed Unit configurations in most simulations.
	The following will affect the calculations, dramatically reducing the achievable WER
	Thicker Glass Types	Reduces the G Value
	Laminated Glass	Reduces the G Value
	Patterned Glass	Reduces the G Value
	Leaded	Effective area reduced - unknown for calculation
	Georgian Bar	Effective area reduced - unknown for calculation
	The G-Value has been significantly weighted in the calculation of the WER to allow older technology coatings
	to be able to compete with the better insulating high performance coatings. The curious result is that the better insulating
	coatings giving a U-Value of 1.1 can not generally achieve an A - Rating even though they give circa 10% more insulation.
	The U-Value is not reduced by thicker glass, laminated or patterned glass