This is our flagship collection! It is dedicated to clients who are aiming for energy-saving and passive houses. Thermal insulation of 0.58 W/m²K and 4 air tightness class is a limit that is unattainable for many wooden door manufacturers and is difficult to imagine in steel doors. Standard RC2-class and anti-burglar locks ensure the security of the household members. The Arctic line will also help ensure that there will be only a warm atmosphere in your home.