The number of chambers in the window profile affects such indicators as thermal protection, strength and sound insulation.
4 or 5 tight air chambers minimize heat transfer inside the profile, which does not allow air temperature outside the building to affect the microclimate in the room. In other words, regardless of weather conditions, windows with a multi-chamber profile will not let cold to your home in the winter and in the summer heat.
As for strength, the presence of 4 or 5 chambers in the profile creates additional resistance to various types of mechanical loads: wind, operational or when attempting unauthorized intrusion. VIKNALAND profile systems, for example, withstand the tensile pressure up to 550 kg (door leaf up to 700) on a standard corner sample. I.e. breaking a window frame with a multi-chamber profile is extremely difficult.
In addition, the multi-chamber profile affects the level of sound insulation. With the correct selection of profile system and insulated glazing unit, noise from the outside can be reduced to 40-45 dB in the room (slight rustling of leaves), even if you live in a rather noisy place.
By the way, the traditional three-chamber profile does not correspond to DSTU and DBN, because its strength and thermal insulation characteristics are less than necessary. Therefore, we do not recommend risking and immediately stop choosing exactly those windows that meet the standards of thermal preservation and have the necessary certificates of conformity.