To complement our acoustic operable wall systems, we also provide high performance sound retardant door to use as pass doors when the movable wall is operated. This product can be used in public and private areas such as concert hall, theater, sport arena, gymnasium, and home entertainment centers as well. ADR sound retardant door reduces noise transmission between the interior and exterior of the room. Although not its main purpose, the door is also fire resistant. Models for different sound attenuation levels are available.