![Group](https://storage.googleapis.com/wp-static/wp_diamondwindows/764dced9-group.png)
Alitherm 300 windows adhere to British Standard Kitemarked system KM 81580 KM 81543, which includes an extended polyamide thermal break. It’s this that aids the U Value of the product, which is responsible for Alitherm 300’s ‘A’ Rating in terms of energy. This system is appropriate for internal and external uses alike.
![Smart window test (1)](https://storage.googleapis.com/wp-static/wp_diamondwindows/860035ca-smart-window-test-1.jpg)