Vault vent covering

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