This sound proof door has 44mm of thickness, and includes a rim all along its periphery except on the bottom, with a seal in a special profile all around, and close to the pavement with a mechanical system moveable threshold.
The door is composed with steel sheets 1,5 mm thick, and also consists of a core completely filled with absorbent and damping material. It includes an asymmetric European lock with a Yale-type key and special hinges in the model with three-rod adjustment.