How to choose windows: profile class and number of chambers
What profile class A, B, C means, how many chambers a good window needs, and how it affects your heating bill.
Not all windows are the same. Two factors decide the real quality: the profile class and the number of chambers. Here is what to know before requesting a quote.
Profile class (A, B, C)
The class refers to the thickness of the PVC profile's outer walls. Class A (walls over 2.8 mm) is the best: more rigid, more durable and less prone to cracking. Class B has thinner walls, and class C is for applications with no strength requirements. For a home, we always recommend class A.
Number of chambers
Chambers are the internal cavities of the profile. More chambers mean better thermal and acoustic insulation. A 5–6 chamber profile combined with triple glazing reduces heat loss by up to 30% compared with old glazing.
Frequently asked questions
How many chambers are enough?
For the climate in Iași, 5 chambers with low-e double glazing are a good minimum; 6 chambers with triple glazing offer the best thermal comfort.
How do I recognise class A?
Ask for the profile's technical sheet. At ALTRANS we transparently state the manufacturer and profile class in the quote.
