Klas1 use many different glasses, and the range of the energy characteristics are excellent. Glass can be selected to filter the sun's harmful rays, while at the same time, keep the heat inside and cold outside. Also actively heated glasses are available. Heat insulating ability can be improved by increasing the so-called. thermal mass, ie by using an element of TPS (Thermoplastic Spacer), and various gas vacuums.

The right choice of glass can be tailored to big and small glass surfaces to combat indoor climate problems, such as resisting cooling, energy loss and in other cases, for instance, the thermal management of surplus heat.

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