The U value is the measurement of the rate of heat loss through the glazing. The lower the U value, the less heat will be needlessly escaping. The Aru 78 type windows are designed to be energy efficient – the 78 mm frame profile allows using a thicker glazing with a lower U value.


Type
Glazing Glazing thickness U value
Aru patio FOLD 68 Softline IN
2- or 3-layered 24 mm
≥ 1,1 W/m²K
Aru patio FOLD 68 Classic IN 2- or 3-layered 24 mm ≥ 1,1 W/m²K
Aru patio FOLD 78 Softline IN 3-layered 42 mm ≥ 0,5 W/m²K
Aru patio FOLF 78 Classic IN 3-layered 42 mm ≥ 0,5 W/m²K

By changing one of the glasses in the standard glazing, it is possible to make the glazing more sound-proof, safe and private. Laminated glass makes the window more sound-proof. When a toughened glass breaks, the created pieces are small and have round edges that do not injure people; therefore it is advised to use it in crowded places and in big window panes.

Privacy is added by using tinted, opaque or patterned glasses. It is a very common solution for sauna and bathroom windows.