Each profile system is characterized by amount of chambers and profile thickness.
Very first profiles consisted of as low as 2 or 3 chambers. However, with growing demand on improvements in energy efficiency, profile manufacturers developed new systems accommodating 4, 5 and more chambers. More chambers mean more energy efficiency of profile system.
Amount of chambers is calculated across the profile and does not include any additional chambers located above or below the main cross section – in other words, the only importance have chambers located between inside of the house and outside as they are the ones keeping warmth in winter and saving cold air in summer.
Sectional size of the profiles varies usually from 58 to 88 mm. The more is the size the better is energy and noise efficiency. Therefore wider profiles usually combine bigger amount of chambers within the structure.
Thickness of profiles will as well determine maximum thickness of double glazed units, what will be important if you wish to reduce noise or efficiently use triple glazing.