These are apertures designed to conserve energy by reducing the need of air-conditioning throughout the year.
The aluminium frame is divided into two pieces and a separator material (SM) would then be bonded in between them. The SM is a rigid, low thermal conductive polyamide or polyurethane. This prevents temperature transfer through the frame itself.
The separator material:
- can be up to a thousand times less thermally conductive than aluminium and up to a hundred times less conducive than steel;
- helps prevent condensation on the inside of the frame itself, which in turn helps to inhibit the growth of mould, especially within gypsum walls;and
- dampens vibrations, resulting in the reduction of sound transmittance.
Standard thermal break apertures come with clear double-glazed glass. However, it would be more beneficial to utilise low-e double glazing glass, solar glass or, for optimum efficiency, a fusion of both low-e and solar glass.
By coupling the two, the filtering power is increased significantly, blocking up to 50% more unwanted solar energy than standard clear glass, and up to 40% more than even dark tinted glass.