Vault vent covering

The  is an architectural feature used in the Vault-Tec Vaults for air circulation and concealment of a horizontal or vertical vent opening. The coverings are large metal circles with sloping sides wall-mounted to a concrete wall by eight bolts. Five slats, angled to the floor, are mounted within the coverings. The coverings are located in corridors and rooms. Some of the coverings are placed in recesses of corridors for the free, unimpeded traffic of residents. The coverings are a component of the life support system.