Vault vent covering

A  is a type of decorative item used in the Vault-Tec Vaults for air circulation and vent concealment. A covering conceals a horizontal or vertical vent. A covering is a large metal circle with sloping sides mounted to a wall by eight bolts. Five slats, angled to the floor, are placed within a covering. Coverings are located in corridors and rooms. Some coverings are placed in recessed sections of corridors for the free, unimpeded movement of residents. Coverings are periodically checked for maintenance and repair by the Maintenance Department.

Vault 101
On August 3, 2274, Andy is repairing a vent near the Clinic.