Entrance metal door of soundproof metal apartment in St. Petersburg We provide reliable, sound-proof entrance metal doors tailored for apartments with two sealed circuits, decorative materials with high sound insulation parameters, and double doors with sound insulation exceeding 41 decibels. You can choose the model you need in the catalog, or you can order and produce according to various sizes and parameters. According to the configuration and completion, a soundproof apartment door can be manufactured within 2-3 days.