Fire soundproof door WHFDSI EIS-30/44DB
The thickness of the canvas with a double narthex is 58 mm. In the strapping of the canvas, a combination of LVL timber and beech wood was used.
On the box and canvas are 2 circuits of a soundproof seal. A contour of the fire-resistant foaming seal is installed in the box. The door must be equipped with a threshold.