The set of doors-channels includes a door closer that ensures their smooth braking. In general, when closing and opening such doors, there is practically no noise and vibrations. Moreover, these doors do not clap. But this is not all, because the penal door is also completely safe, since it is simply impossible to pinch your hand and cause any injury to yourself and others. It is also worth mentioning a good sound insulation that these doors provide due to the seal that is installed around the entire perimeter.