What is Low-e glass ?
Glass used in double glazed window for thermal insulation is known as Low-E, or low-emissivity glass. It has a transparent metallic coating that works in two ways to economise heating energy. The dual action coating reflects heat back into the room, whilst allowing heat and light from the sun (known as passive solar heat gain) to pass through.
As government building regulations become more stringent and heating costs rise, it is becoming even more important to choose the most effective thermal insulated glass. The British Fenestration rating council (BFRC) has set out an official window energy rating table, ranging from A to G with A being the most energy efficient. Windows with a C rating or higher are endorsed by the government backed energy saving trust.
The energy efficiency of a thermal insulated glass is measured by its U value ( formerly K glass) and its solar heat gain coefficient(g). In addition to the low e glass used, energy ratings can be further enhanced by the variety of spacer bars, cavity and Edge spacing used in the double glazed unit.

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