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DuraGreen - Understanding Window Energy Ratings


The British Fenestration Rating Council's Domestic Window Energy Rating Schene provides a way to compare the energy performance of windows. 

Windows that achieve a C rating or higher can carry the 'Energy Saving Recommended' tag. All our Energy Efficient windows achieve C rated or better energy efficiency. 


Thermal Transmittance

This measures how well a product prevents heat escaping.


Solar Factor

This measures how well a product blocks heat caused by sunlight.


Air Leakage

This relates to the volume of air leakage from a window.

Lower numbers achieve a higher rating (A to G).

DuraGreen Windows could reduce your wasted home energy by up to 20%