- Door materialSteel
An essential role in it is played by heater material. Now, to make the warmed and ecologically safe metal doors, such materials as basalt or mineral wool are used. Possessing absolute incombustibility and hygroscopicity, this material creates a peculiar layer between a cloth of a door and the cold street (corridor), excepting thereby heatlosses indoors.
Besides protection of the room against cold the warmed entrance doors significantly reduce noise level in rooms that is explained by the good soundproofing properties of the applied materials. Rather often this fact also is defining in the choice of metal doors of this category.